[1.21.5] Fabric client connecting to Quilt server errors out

[Leo40Git]

Describe the bug

When a Fabric client attempts to connect to a Quilt server, the Fabric client will fail to connect due to an internal exception.

How did QSL break?

The registry module's Fabric-compatible sync code seems to be at fault here.

Which environment did you encounter this bug in?

Server

Logs

https://mclo.gs/1E5irOn

[OroArmor]

Nooooooooooooooooo. I don't think I ever tested this oops

[OroArmor]

Oh wait I never got around to my new way of doing it that's why. It's supposed to be left to qfapi ideally, just not implemented