A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Server thread
Stacktrace:
at com.github.alexthe666.citadel.server.entity.collision.ICustomCollisions.getAllowedMovementForEntity(ICustomCollisions.java:30) ~[citadel-2.4.1-1.20.jar%23208!/:2.4.1-1.20] {re:classloading}
at com.github.alexthe666.alexsmobs.entity.EntityTiger.m_20272_(EntityTiger.java:308) ~[alexsmobs-1.22.5.jar%23198!/:1.22.5] {re:classloading}
at net.minecraft.world.entity.Entity.m_6478_(Entity.java:632) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:computing_frames,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:enchantment.EntityMixin,pl:mixin:APP:curios.mixins.json:AccessorEntity,pl:mixin:APP:balm.mixins.json:EntityMixin,pl:mixin:APP:carryon.mixins.json:EntityMixin,pl:mixin:APP:supplementaries-common.mixins.json:EntityMixin,pl:mixin:APP:domesticationinnovation.mixins.json:EntityMixin,pl:mixin:APP:assets/sound_physics_remastered/sound_physics_remastered.mixins.json:EntityMixin,pl:mixin:A}
at net.minecraft.world.entity.LivingEntity.m_21074_(LivingEntity.java:2189) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:computing_frames,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:LivingEntityMixin,pl:mixin:APP:biomemakeover-common.mixins.json:LivingEntityMixin_Lootblock,pl:mixin:APP:biomemakeover-common.mixins.json:enchantment.LivingEntityMixin,pl:mixin:APP:taniwha-common.mixins.json:totem.LivingEntityMixin,pl:mixin:APP:curios.mixins.json:MixinLivingEntity,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:supplementaries-common.mixins.json:LivingEntityMixin,pl:mixin:APP:domesticationinnovation.mixins.json:LivingEntityMixin,pl:mixin:A}
at net.minecraft.world.entity.LivingEntity.m_7023_(LivingEntity.java:2126) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:computing_frames,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:LivingEntityMixin,pl:mixin:APP:biomemakeover-common.mixins.json:LivingEntityMixin_Lootblock,pl:mixin:APP:biomemakeover-common.mixins.json:enchantment.LivingEntityMixin,pl:mixin:APP:taniwha-common.mixins.json:totem.LivingEntityMixin,pl:mixin:APP:curios.mixins.json:MixinLivingEntity,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:supplementaries-common.mixins.json:LivingEntityMixin,pl:mixin:APP:domesticationinnovation.mixins.json:LivingEntityMixin,pl:mixin:A}
at com.github.alexthe666.alexsmobs.entity.EntityTiger.m_7023_(EntityTiger.java:222) ~[alexsmobs-1.22.5.jar%23198!/:1.22.5] {re:classloading}
at net.minecraft.world.entity.LivingEntity.m_8107_(LivingEntity.java:2599) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:computing_frames,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:LivingEntityMixin,pl:mixin:APP:biomemakeover-common.mixins.json:LivingEntityMixin_Lootblock,pl:mixin:APP:biomemakeover-common.mixins.json:enchantment.LivingEntityMixin,pl:mixin:APP:taniwha-common.mixins.json:totem.LivingEntityMixin,pl:mixin:APP:curios.mixins.json:MixinLivingEntity,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:supplementaries-common.mixins.json:LivingEntityMixin,pl:mixin:APP:domesticationinnovation.mixins.json:LivingEntityMixin,pl:mixin:A}
at net.minecraft.world.entity.Mob.m_8107_(Mob.java:689) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:APP:moonlight-common.mixins.json:EntityMixin,pl:mixin:APP:biomemakeover-common.mixins.json:MobAccess,pl:mixin:APP:domesticationinnovation.mixins.json:MobMixin,pl:mixin:A}
at net.minecraft.world.entity.AgeableMob.m_8107_(AgeableMob.java:128) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,re:computing_frames,re:classloading,pl:mixin:APP:biomemakeover-common.mixins.json:AgeableMobMixin_Stuntable,pl:mixin:APP:domesticationinnovation.mixins.json:AgeableMobMixin,pl:mixin:A}
at net.minecraft.world.entity.animal.Animal.m_8107_(Animal.java:54) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:computing_frames,re:mixin,re:classloading,pl:mixin:APP:domesticationinnovation.mixins.json:AnimalMixin,pl:mixin:A}
at net.minecraft.world.entity.LivingEntity.m_8119_(LivingEntity.java:2292) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:computing_frames,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:LivingEntityMixin,pl:mixin:APP:biomemakeover-common.mixins.json:LivingEntityMixin_Lootblock,pl:mixin:APP:biomemakeover-common.mixins.json:enchantment.LivingEntityMixin,pl:mixin:APP:taniwha-common.mixins.json:totem.LivingEntityMixin,pl:mixin:APP:curios.mixins.json:MixinLivingEntity,pl:mixin:APP:citadel.mixins.json:LivingEntityMixin,pl:mixin:APP:supplementaries-common.mixins.json:LivingEntityMixin,pl:mixin:APP:domesticationinnovation.mixins.json:LivingEntityMixin,pl:mixin:A}
at net.minecraft.world.entity.Mob.m_8119_(Mob.java:433) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:APP:moonlight-common.mixins.json:EntityMixin,pl:mixin:APP:biomemakeover-common.mixins.json:MobAccess,pl:mixin:APP:domesticationinnovation.mixins.json:MobMixin,pl:mixin:A}
at com.github.alexthe666.alexsmobs.entity.EntityTiger.m_8119_(EntityTiger.java:312) ~[alexsmobs-1.22.5.jar%23198!/:1.22.5] {re:classloading}
at net.minecraft.server.level.ServerLevel.m_8647_(ServerLevel.java:693) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:multipart.ServerLevelMixin,pl:mixin:APP:taniwha-common.mixins.json:level.data.ServerLevelMixin,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:sereneseasons.mixins.json:MixinServerLevel,pl:mixin:APP:supplementaries-common.mixins.json:ServerLevelMixin,pl:mixin:A}
at net.minecraft.world.level.Level.m_46653_(Level.java:479) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:computing_frames,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:multipart.LevelMixin,pl:mixin:APP:citadel.mixins.json:LevelMixin,pl:mixin:APP:sereneseasons.mixins.json:MixinLevel,pl:mixin:A}
at net.minecraft.server.level.ServerLevel.m_184063_(ServerLevel.java:343) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:multipart.ServerLevelMixin,pl:mixin:APP:taniwha-common.mixins.json:level.data.ServerLevelMixin,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:sereneseasons.mixins.json:MixinServerLevel,pl:mixin:APP:supplementaries-common.mixins.json:ServerLevelMixin,pl:mixin:A}
at net.minecraft.world.level.entity.EntityTickList.m_156910_(EntityTickList.java:54) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:classloading}
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:323) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:multipart.ServerLevelMixin,pl:mixin:APP:taniwha-common.mixins.json:level.data.ServerLevelMixin,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:sereneseasons.mixins.json:MixinServerLevel,pl:mixin:APP:supplementaries-common.mixins.json:ServerLevelMixin,pl:mixin:A}
-- Entity being ticked --
Details:
Entity Type: alexsmobs:tiger (com.github.alexthe666.alexsmobs.entity.EntityTiger)
Entity ID: 132
Entity Name: Tigre
Entity's Exact location: -376.50, 97.00, 437.50
Entity's Block location: World: (-377,97,437), Section: (at 7,1,5 in -24,6,27; chunk contains blocks -384,-64,432 to -369,319,447), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,-64,0 to -1,319,511)
Entity's Momentum: 0.00, 0.00, 0.00
Entity's Passengers: []
Entity's Vehicle: null
Stacktrace:
at net.minecraft.world.level.Level.m_46653_(Level.java:479) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:computing_frames,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:multipart.LevelMixin,pl:mixin:APP:citadel.mixins.json:LevelMixin,pl:mixin:APP:sereneseasons.mixins.json:MixinLevel,pl:mixin:A}
at net.minecraft.server.level.ServerLevel.m_184063_(ServerLevel.java:343) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:multipart.ServerLevelMixin,pl:mixin:APP:taniwha-common.mixins.json:level.data.ServerLevelMixin,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:sereneseasons.mixins.json:MixinServerLevel,pl:mixin:APP:supplementaries-common.mixins.json:ServerLevelMixin,pl:mixin:A}
at net.minecraft.world.level.entity.EntityTickList.m_156910_(EntityTickList.java:54) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:classloading}
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:323) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:biomemakeover-common.mixins.json:multipart.ServerLevelMixin,pl:mixin:APP:taniwha-common.mixins.json:level.data.ServerLevelMixin,pl:mixin:APP:citadel.mixins.json:ServerLevelMixin,pl:mixin:APP:sereneseasons.mixins.json:MixinServerLevel,pl:mixin:APP:supplementaries-common.mixins.json:ServerLevelMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:893) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:814) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:124) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:classloading,xf:OptiFine:default}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:661) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at java.lang.Thread.run(Thread.java:833) ~[?:?] {}

-- Affected level --
Details:
All players: 1 total; [ServerPlayer['Abrans'/124, l='ServerLevel[PERFEITO]', x=-375.43, y=97.00, z=436.45]]
Chunk stats: 15570
Level dimension: minecraft:overworld
Level spawn location: World: (0,120,0), Section: (at 0,8,0 in 0,7,0; chunk contains blocks 0,-64,0 to 15,319,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,-64,0 to 511,319,511)
Level time: 2966424 game time, 4624170 day time
Level name: PERFEITO
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Level weather: Rain time: 42887 (now: false), thunder time: 56442 (now: false)
Known server brands: forge
Removed feature flags:
Level was modded: true
Level storage version: 0x04ABD - Anvil
Stacktrace:
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:893) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:814) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:124) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:classloading,xf:OptiFine:default}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:661) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251) ~[client-1.20.1-20230612.114412-srg.jar%23238!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:A}
at java.lang.Thread.run(Thread.java:833) ~[?:?] {}

dupe #1700

Update - I deleted all the mods to test it out, and yes it continues to have this crash with tiger and also Rocky roller.