The game automatically crashes when adding the amulet to the corresponding slot.
Via NbtExplorer I removed the necklace from the slot and it did not crash when loading the world but the player remains at a smaller scale.

Pastebin latest log https://pastebin.com/e8kU9JPt

The error that minecraft launcher gives is: The game crashed whilst unexpected error
Error: java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 8

This crash is unrelated to Artifacts, it's a compatibility issue between Inventory HUD+ and Accessories. This crash seems to happen when equipping any curio, I managed to reproduce it myself with Charm of Undying.

True the blame is accessories for this one, noticed such and comes down to a mixin within the living entity that leads to such crashing out. Just going to disable such unless really needed by someone down the road.

The game automatically crashes when adding the amulet to the corresponding slot. Via NbtExplorer I removed the necklace from the slot and it did not crash when loading the world but the player remains at a smaller scale.

@LilFaker I did upload a fix for such on both Curseforge and Modrinth that stops the crash from happening