Anyone have a solution to this? it may be simple but I don't see it yet. This is for 1.16.4

Use Fabric Loader 0.14.25, also next time please do a search to see if your issue has already been solved. If this solves your issue please close the ticket.

In my case (MC 1.18.1 with different mods / mod versions) it worked after i switched from the newest fabric loader version to 1.12.12. Don't know why it now works, but i hope it helps.