[Client side Crash 1.16.5] Incompatibility with tooltip mixin-ing mods

[Colin-J-Wood]

Suggested mods to test with:
Item Borders
Quark
Legendary Tooltips

https://pastebin.com/iNzgkJhy

[Colin-J-Wood]

seems like your mod does not handle its existence in the creative inventory very well, as it tries to build its own data after other mods try to access it.