I see there are a few similar bug reports for other versions, though the list of installed mods for me is a bit higher.
I first ran into this issue towards the end of 1.21.5's life and again now with 1.21.8.

Technical info is as follows

Server: Fabric Loader 0.16.14 Version 1.21.8

Installed mods: (pictured)

OPAC: 0.25.1 Fabric 1.21.8

Startup log: https://mclo.gs/p82crc5

#741

Thanks for reporting. I figured it out. A fix is coming very soon.