Don't ask me how this one got into the situation, I'm honestly not sure how. One member of my server managed to get a butterfly wyvern up a tree.

05.11 01:59:28 [Server] INFO ---- Minecraft Crash Report ----
05.11 01:59:28 [Server] INFO // But it works on my machine.
05.11 01:59:28 [Server] INFO Time: 11/5/22 1:59 AM
05.11 01:59:28 [Server] INFO Description: Watching Server
05.11 01:59:28 [Server] INFO java.lang.Error: ServerHangWatchdog detected that a single server tick took 60.00 seconds (should be max 0.05)
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkAndSwimNodeProcessor.func_186330_a(SourceFile:243) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkNodeProcessor.func_193577_a(WalkNodeProcessor.java:350) ~[?:?] {re:mixin,re:classloading,pl:mixin:APP:randompatches.mixins.json:WalkNodeProcessorMixin,pl:mixin:APP:byg.mixins.json:common.MixinWalkNodeProcessor,pl:mixin:A}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkNodeProcessor.func_186319_a(WalkNodeProcessor.java:321) ~[?:?] {re:mixin,re:classloading,pl:mixin:APP:randompatches.mixins.json:WalkNodeProcessorMixin,pl:mixin:APP:byg.mixins.json:common.MixinWalkNodeProcessor,pl:mixin:A}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkAndSwimNodeProcessor.func_203245_a(SourceFile:139) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkAndSwimNodeProcessor.func_222859_a(SourceFile:97) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathFinder.func_227479_a_(SourceFile:97) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathFinder.func_227478_a_(SourceFile:45) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathNavigator.func_225464_a(PathNavigator.java:129) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathNavigator.func_75494_a(PathNavigator.java:110) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathNavigator.func_75497_a(PathNavigator.java:146) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at com.github.wolfshotz.wyrmroost.entities.dragon.ButterflyLeviathanEntity$AttackGoal.func_75246_d(ButterflyLeviathanEntity.java:684) ~[wyrmroost:1.16.3-1.2.11] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.ai.goal.PrioritizedGoal.func_75246_d(SourceFile:55) ~[?:?] {re:classloading,pl:accesstransformer:B}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.ai.goal.GoalSelector$$Lambda$35243/980185061.accept(Unknown Source) ~[?:?] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.ai.goal.GoalSelector.func_75774_a(SourceFile:88) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.MobEntity.func_70626_be(MobEntity.java:682) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMobEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.LivingEntity.func_70636_d(LivingEntity.java:2413) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:astralsorcery:set_player_field,xf:fml:placebo:placeboshieldblock,xf:fml:apotheosis:apothshieldblock,xf:fml:apotheosis:apothpotiondmg,xf:fml:astralsorcery:water_movement_slowdown_prevention,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:astralsorcery:set_player_field,xf:fml:placebo:placeboshieldblock,xf:fml:apotheosis:apothshieldblock,xf:fml:apotheosis:apothpotiondmg,xf:fml:astralsorcery:water_movement_slowdown_prevention,pl:mixin:APP:supplementaries.mixins.json:LivingEntityMixin,pl:mixin:APP:blue_skies.mixins.json:LivingEntityMixin,pl:mixin:APP:eidolon.mixins.json:LivingEntityMixin,pl:mixin:APP:vampirism.mixins.json:LivingEntityAccessor,pl:mixin:APP:vampirism.mixins.json:MixinLivingEntity,pl:mixin:APP:werewolves.mixins.json:LivingEntityInvoker,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:resourcefulbees.mixins.json:LivingEntityAccessor,pl:mixin:APP:resourcefulbees.mixins.json:MixinLivingEntity,pl:mixin:APP:ars_nouveau.mixins.json:ExpInvokerMixin,pl:mixin:APP:ars_nouveau.mixins.json:MixinLivingEntity,pl:mixin:APP:upgrade_aquatic.mixins.json:LivingEntityMixin,pl:mixin:APP:kubejs-common.mixins.json:LivingEntityMixin,pl:mixin:APP:expandability.mixins.json:swimming.LivingEntityMixin,pl:mixin:APP:assets/shetiphiancore/shetiphiancore.mixins.json:MixinLivingEntity,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorLivingEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.MobEntity.func_70636_d(MobEntity.java:488) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMobEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.AgeableEntity.func_70636_d(SourceFile:127) ~[?:?] {re:mixin,re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.passive.AnimalEntity.func_70636_d(AnimalEntity.java:51) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:randompatches.mixins.json:AnimalEntityMixin,pl:mixin:APP:byg.mixins.json:common.entity.MixinAnimalEntity,pl:mixin:APP:resourcefulbees.mixins.json:AnimalEntityAccessor,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at com.github.wolfshotz.wyrmroost.entities.dragon.AbstractDragonEntity.func_70636_d(AbstractDragonEntity.java:295) ~[wyrmroost:1.16.3-1.2.11] {re:classloading}
05.11 01:59:28 [Server] INFO at com.github.wolfshotz.wyrmroost.entities.dragon.ButterflyLeviathanEntity.func_70636_d(ButterflyLeviathanEntity.java:120) ~[wyrmroost:1.16.3-1.2.11] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.LivingEntity.func_70071_h_(LivingEntity.java:2160) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:astralsorcery:set_player_field,xf:fml:placebo:placeboshieldblock,xf:fml:apotheosis:apothshieldblock,xf:fml:apotheosis:apothpotiondmg,xf:fml:astralsorcery:water_movement_slowdown_prevention,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:astralsorcery:set_player_field,xf:fml:placebo:placeboshieldblock,xf:fml:apotheosis:apothshieldblock,xf:fml:apotheosis:apothpotiondmg,xf:fml:astralsorcery:water_movement_slowdown_prevention,pl:mixin:APP:supplementaries.mixins.json:LivingEntityMixin,pl:mixin:APP:blue_skies.mixins.json:LivingEntityMixin,pl:mixin:APP:eidolon.mixins.json:LivingEntityMixin,pl:mixin:APP:vampirism.mixins.json:LivingEntityAccessor,pl:mixin:APP:vampirism.mixins.json:MixinLivingEntity,pl:mixin:APP:werewolves.mixins.json:LivingEntityInvoker,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:resourcefulbees.mixins.json:LivingEntityAccessor,pl:mixin:APP:resourcefulbees.mixins.json:MixinLivingEntity,pl:mixin:APP:ars_nouveau.mixins.json:ExpInvokerMixin,pl:mixin:APP:ars_nouveau.mixins.json:MixinLivingEntity,pl:mixin:APP:upgrade_aquatic.mixins.json:LivingEntityMixin,pl:mixin:APP:kubejs-common.mixins.json:LivingEntityMixin,pl:mixin:APP:expandability.mixins.json:swimming.LivingEntityMixin,pl:mixin:APP:assets/shetiphiancore/shetiphiancore.mixins.json:MixinLivingEntity,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorLivingEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.MobEntity.func_70071_h_(MobEntity.java:300) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMobEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at com.github.wolfshotz.wyrmroost.entities.dragon.AbstractDragonEntity.func_70071_h_(AbstractDragonEntity.java:288) ~[wyrmroost:1.16.3-1.2.11] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.world.server.ServerWorld.func_217479_a(ServerWorld.java:611) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:observable.common.json:ServerLevelMixin,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:APP:endergetic.mixins.json:ServerWorldMixin,pl:mixin:APP:quark.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.world.server.ServerWorld$$Lambda$35203/924276318.accept(Unknown Source) ~[?:?] {}
05.11 01:59:28 [Server] INFO at net.minecraft.world.World.func_217390_a(World.java:1685) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:mixin:APP:lootr.mixins.json:MixinWorld,pl:mixin:APP:observable.common.json:LevelMixin,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:404) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:observable.common.json:ServerLevelMixin,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:APP:endergetic.mixins.json:ServerWorldMixin,pl:mixin:APP:quark.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:851) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?] {re:classloading,pl:accesstransformer:B}
05.11 01:59:28 [Server] INFO at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:787) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:642) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.server.MinecraftServer$$Lambda$33726/926841255.run(Unknown Source) ~[?:?] {}
05.11 01:59:28 [Server] INFO at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO A detailed walkthrough of the error, its code path and all known details is as follows:
05.11 01:59:28 [Server] INFO ---------------------------------------------------------------------------------------
05.11 01:59:28 [Server] INFO -- Head --
05.11 01:59:28 [Server] INFO Thread: Server Watchdog
05.11 01:59:28 [Server] INFO Stacktrace:
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkAndSwimNodeProcessor.func_186330_a(SourceFile:243) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkNodeProcessor.func_193577_a(WalkNodeProcessor.java:350) ~[?:?] {re:mixin,re:classloading,pl:mixin:APP:randompatches.mixins.json:WalkNodeProcessorMixin,pl:mixin:APP:byg.mixins.json:common.MixinWalkNodeProcessor,pl:mixin:A}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkNodeProcessor.func_186319_a(WalkNodeProcessor.java:321) ~[?:?] {re:mixin,re:classloading,pl:mixin:APP:randompatches.mixins.json:WalkNodeProcessorMixin,pl:mixin:APP:byg.mixins.json:common.MixinWalkNodeProcessor,pl:mixin:A}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkAndSwimNodeProcessor.func_203245_a(SourceFile:139) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.WalkAndSwimNodeProcessor.func_222859_a(SourceFile:97) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathFinder.func_227479_a_(SourceFile:97) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathFinder.func_227478_a_(SourceFile:45) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathNavigator.func_225464_a(PathNavigator.java:129) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathNavigator.func_75494_a(PathNavigator.java:110) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.pathfinding.PathNavigator.func_75497_a(PathNavigator.java:146) ~[?:?] {re:classloading}
05.11 01:59:28 [Server] INFO at com.github.wolfshotz.wyrmroost.entities.dragon.ButterflyLeviathanEntity$AttackGoal.func_75246_d(ButterflyLeviathanEntity.java:684) ~[wyrmroost:1.16.3-1.2.11] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.ai.goal.PrioritizedGoal.func_75246_d(SourceFile:55) ~[?:?] {re:classloading,pl:accesstransformer:B}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.ai.goal.GoalSelector$$Lambda$35243/980185061.accept(Unknown Source) ~[?:?] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485) ~[?:1.8.0_312] {}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.ai.goal.GoalSelector.func_75774_a(SourceFile:88) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.MobEntity.func_70626_be(MobEntity.java:682) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMobEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.LivingEntity.func_70636_d(LivingEntity.java:2413) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:astralsorcery:set_player_field,xf:fml:placebo:placeboshieldblock,xf:fml:apotheosis:apothshieldblock,xf:fml:apotheosis:apothpotiondmg,xf:fml:astralsorcery:water_movement_slowdown_prevention,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:astralsorcery:set_player_field,xf:fml:placebo:placeboshieldblock,xf:fml:apotheosis:apothshieldblock,xf:fml:apotheosis:apothpotiondmg,xf:fml:astralsorcery:water_movement_slowdown_prevention,pl:mixin:APP:supplementaries.mixins.json:LivingEntityMixin,pl:mixin:APP:blue_skies.mixins.json:LivingEntityMixin,pl:mixin:APP:eidolon.mixins.json:LivingEntityMixin,pl:mixin:APP:vampirism.mixins.json:LivingEntityAccessor,pl:mixin:APP:vampirism.mixins.json:MixinLivingEntity,pl:mixin:APP:werewolves.mixins.json:LivingEntityInvoker,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:resourcefulbees.mixins.json:LivingEntityAccessor,pl:mixin:APP:resourcefulbees.mixins.json:MixinLivingEntity,pl:mixin:APP:ars_nouveau.mixins.json:ExpInvokerMixin,pl:mixin:APP:ars_nouveau.mixins.json:MixinLivingEntity,pl:mixin:APP:upgrade_aquatic.mixins.json:LivingEntityMixin,pl:mixin:APP:kubejs-common.mixins.json:LivingEntityMixin,pl:mixin:APP:expandability.mixins.json:swimming.LivingEntityMixin,pl:mixin:APP:assets/shetiphiancore/shetiphiancore.mixins.json:MixinLivingEntity,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorLivingEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.MobEntity.func_70636_d(MobEntity.java:488) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMobEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.AgeableEntity.func_70636_d(SourceFile:127) ~[?:?] {re:mixin,re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.passive.AnimalEntity.func_70636_d(AnimalEntity.java:51) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:randompatches.mixins.json:AnimalEntityMixin,pl:mixin:APP:byg.mixins.json:common.entity.MixinAnimalEntity,pl:mixin:APP:resourcefulbees.mixins.json:AnimalEntityAccessor,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at com.github.wolfshotz.wyrmroost.entities.dragon.AbstractDragonEntity.func_70636_d(AbstractDragonEntity.java:295) ~[wyrmroost:1.16.3-1.2.11] {re:classloading}
05.11 01:59:28 [Server] INFO at com.github.wolfshotz.wyrmroost.entities.dragon.ButterflyLeviathanEntity.func_70636_d(ButterflyLeviathanEntity.java:120) ~[wyrmroost:1.16.3-1.2.11] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.LivingEntity.func_70071_h_(LivingEntity.java:2160) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:astralsorcery:set_player_field,xf:fml:placebo:placeboshieldblock,xf:fml:apotheosis:apothshieldblock,xf:fml:apotheosis:apothpotiondmg,xf:fml:astralsorcery:water_movement_slowdown_prevention,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:astralsorcery:set_player_field,xf:fml:placebo:placeboshieldblock,xf:fml:apotheosis:apothshieldblock,xf:fml:apotheosis:apothpotiondmg,xf:fml:astralsorcery:water_movement_slowdown_prevention,pl:mixin:APP:supplementaries.mixins.json:LivingEntityMixin,pl:mixin:APP:blue_skies.mixins.json:LivingEntityMixin,pl:mixin:APP:eidolon.mixins.json:LivingEntityMixin,pl:mixin:APP:vampirism.mixins.json:LivingEntityAccessor,pl:mixin:APP:vampirism.mixins.json:MixinLivingEntity,pl:mixin:APP:werewolves.mixins.json:LivingEntityInvoker,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:resourcefulbees.mixins.json:LivingEntityAccessor,pl:mixin:APP:resourcefulbees.mixins.json:MixinLivingEntity,pl:mixin:APP:ars_nouveau.mixins.json:ExpInvokerMixin,pl:mixin:APP:ars_nouveau.mixins.json:MixinLivingEntity,pl:mixin:APP:upgrade_aquatic.mixins.json:LivingEntityMixin,pl:mixin:APP:kubejs-common.mixins.json:LivingEntityMixin,pl:mixin:APP:expandability.mixins.json:swimming.LivingEntityMixin,pl:mixin:APP:assets/shetiphiancore/shetiphiancore.mixins.json:MixinLivingEntity,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorLivingEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.entity.MobEntity.func_70071_h_(MobEntity.java:300) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMobEntity,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at com.github.wolfshotz.wyrmroost.entities.dragon.AbstractDragonEntity.func_70071_h_(AbstractDragonEntity.java:288) ~[wyrmroost:1.16.3-1.2.11] {re:classloading}
05.11 01:59:28 [Server] INFO at net.minecraft.world.server.ServerWorld.func_217479_a(ServerWorld.java:611) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:observable.common.json:ServerLevelMixin,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:APP:endergetic.mixins.json:ServerWorldMixin,pl:mixin:APP:quark.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.world.server.ServerWorld$$Lambda$35203/924276318.accept(Unknown Source) ~[?:?] {}
05.11 01:59:28 [Server] INFO at net.minecraft.world.World.func_217390_a(World.java:1685) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:mixin:APP:lootr.mixins.json:MixinWorld,pl:mixin:APP:observable.common.json:LevelMixin,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:404) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:observable.common.json:ServerLevelMixin,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:APP:endergetic.mixins.json:ServerWorldMixin,pl:mixin:APP:quark.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:851) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?] {re:classloading,pl:accesstransformer:B}
05.11 01:59:28 [Server] INFO at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:787) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:642) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
05.11 01:59:28 [Server] INFO -- Thread Dump --
05.11 01:59:28 [Server] INFO Details:

From my very limited understanding, it looks like the pathing specifically hates that action. We fixed it by another member of the server finding it and guiding it back to the ocean. Just be aware that it can currently cripple a server in a few seconds though.