Print of Startup log:
MC: 1.21.1 , Forge: 47.2.1

[21:05:59] [Worker-Main-2/ERROR] [ne.mi.co.ForgeHooks/]: Couldn't parse element loot_tables:fromtheshadows:gameplay/junk
com.google.gson.JsonSyntaxException: Unknown type 'minecraft:alternative'
at net.minecraft.world.level.storage.loot.GsonAdapterFactory$JsonAdapter.deserialize(GsonAdapterFactory.java:99) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:76) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:72) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1214) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1319) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1290) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.deserialize(TreeTypeAdapter.java:179) ~[gson-2.10.jar%2372!/:?] {}
at net.minecraft.util.GsonHelper.m_13808_(GsonHelper.java:463) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.util.GsonHelper.m_13845_(GsonHelper.java:481) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.world.level.storage.loot.entries.LootPoolEntryContainer$Serializer.m_7561_(LootPoolEntryContainer.java:85) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.world.level.storage.loot.entries.LootPoolEntryContainer$Serializer.m_7561_(LootPoolEntryContainer.java:74) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.world.level.storage.loot.GsonAdapterFactory$JsonAdapter.deserialize(GsonAdapterFactory.java:102) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:76) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:72) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1214) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1319) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1290) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.deserialize(TreeTypeAdapter.java:179) ~[gson-2.10.jar%2372!/:?] {}
at net.minecraft.util.GsonHelper.m_13808_(GsonHelper.java:463) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.util.GsonHelper.m_13836_(GsonHelper.java:471) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.world.level.storage.loot.LootPool$Serializer.deserialize(LootPool.java:192) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.world.level.storage.loot.LootPool$Serializer.deserialize(LootPool.java:189) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:76) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:72) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1214) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1319) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1290) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.deserialize(TreeTypeAdapter.java:179) ~[gson-2.10.jar%2372!/:?] {}
at net.minecraft.util.GsonHelper.m_13808_(GsonHelper.java:463) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.util.GsonHelper.m_13845_(GsonHelper.java:481) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.world.level.storage.loot.LootTable$Serializer.deserialize(LootTable.java:294) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.world.level.storage.loot.LootTable$Serializer.deserialize(LootTable.java:291) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:76) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1214) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1319) ~[gson-2.10.jar%2372!/:?] {}
at com.google.gson.Gson.fromJson(Gson.java:1261) ~[gson-2.10.jar%2372!/:?] {}
at net.minecraftforge.common.ForgeHooks.loadLootTable(ForgeHooks.java:871) ~[forge-1.20.1-47.2.1-universal.jar%23376!/:?] {re:mixin,re:classloading}
at net.minecraftforge.common.ForgeHooks.lambda$getLootTableDeserializer$3(ForgeHooks.java:848) ~[forge-1.20.1-47.2.1-universal.jar%23376!/:?] {re:mixin,re:classloading}
at net.minecraft.world.level.storage.loot.LootDataType.deserialize(LootDataType.java:45) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at net.minecraft.world.level.storage.loot.LootDataManager.lambda$scheduleElementParse$4(LootDataManager.java:56) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at java.util.HashMap.forEach(HashMap.java:1429) ~[?:?] {re:mixin}
at net.minecraft.world.level.storage.loot.LootDataManager.m_278660_(LootDataManager.java:55) ~[server-1.20.1-20230612.114412-srg.jar%23371!/:?] {re:classloading}
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387) ~[?:?] {}
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1311) ~[?:?] {}
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1840) ~[?:?] {re:mixin,re:computing_frames}
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1806) ~[?:?] {re:mixin,re:computing_frames}
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177) ~[?:?] {re:mixin}