Description
Having an ender chest from EnderChests mod in player's inventory instantly causes a crash. You no longer can join the world afterwads. Removing Relics or EnderChests mod fixes the issue.
Crash report has stack trace for Relics mod only, if this is an issue on EnderChest's side, please let me know.

Steps to reproduce

1. Install both Relics and EnderChests
2. Spawn or craft an ender chest.

Crash Report
crash-2021-12-21_00.38.44-server.txt

Hi. Seems like this is because of similar NBT tag name with Relics and Enderchests mods. It can be fixed on both sides, one mod just should change tag name to any other.

Relics will change it in the next major update.

Hey. You can try to use it with this version. It shouldn't crash anymore, but it's still not a fix.