I decided to try and get some mods using connector and realised the game kept crashing during loading. I tested a bunch and turns out that Forgified Fabric API causes crashes with JSON Things installed.
latest.log

Yep that's the usual error with JsonThings. because I need to load stuff BEFORE registries, I have a custom resource manager with a custom PackType that I inject via mixin.
However some mods assume that if it's not a resource pack, it's a datapck, and break when they encounter my additional pack type that loads early and isn't a datapack.
I can't fix this on my end, it is something that would need to be fixed in Forgified Fabric API.

Ah, okay then. Thanks for the clarification