Not sure of where exactly is the issue, but wanted to share it.

Minecraft 1.20.1

Forge loader

https://pastebin.com/hUPeYZfB

im going to suggest this is an issue with dungeonsartifacts. Specifically here has been registered twice, using the names duneons:blacksmith and dungeonsartifacts:anvil_poi.

Caused by: java.lang.IllegalArgumentException: The object PoiType[matchingStates=[Block{minecraft:anvil}[facing=east], Block{minecraft:anvil}[facing=north], Block{minecraft:anvil}[facing=west], Block{minecraft:anvil}[facing=south]], maxTickets=1, validRange=1]{763c4fd5} has been registered twice, using the names duneons:blacksmith and dungeonsartifacts:anvil_poi. (Other object at this id is PoiType[matchingStates=[Block{minecraft:anvil}[facing=east], Block{minecraft:anvil}[facing=north], Block{minecraft:anvil}[facing=west], Block{minecraft:anvil}[facing=south]], maxTickets=1, validRange=1]{bf68ea5})
at TRANSFORMER/[email protected]/net.minecraftforge.registries.ForgeRegistry.add(ForgeRegistry.java:429)
at TRANSFORMER/[email protected]/net.minecraftforge.registries.ForgeRegistry.add(ForgeRegistry.java:394)
at TRANSFORMER/[email protected]/net.minecraftforge.registries.ForgeRegistry.register(ForgeRegistry.java:130)
at TRANSFORMER/[email protected]/net.minecraftforge.registries.RegisterEvent.register(RegisterEvent.java:59)
at TRANSFORMER/[email protected]/net.minecraftforge.registries.DeferredRegister.addEntries(DeferredRegister.java:386)
at TRANSFORMER/[email protected]/net.minecraftforge.registries.DeferredRegister$EventDispatcher.handleEvent(DeferredRegister.java:328)
at TRANSFORMER/[email protected]/net.minecraftforge.registries.__EventDispatcher_handleEvent_RegisterEvent.invoke(.dynamic)
at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:73)
at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.post(EventBus.java:315)
at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.post(EventBus.java:296)
at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.javafmlmod.FMLModContainer.acceptEvent(FMLModContainer.java:107)
... 34 more