ummmm

i removed dependencies for it in fabric_loader_dependencies.json and it's working

Unfortunately, the creator made a little syntax mistake in the fabric.mod.json file.
Instead of
"minecraft": "1.20.5,1.20.6",
it should say:
"minecraft": ["1.20.5", "1.20.6"],
Once they realize they will surely quickly fix this error but until then:
If you have something like 7zip or winrar installed, you can open the jar of the mod, edit the file called fabric.mod.json changing the line I mentioned and then replace the file in the archive. Then you will able to run this version of the mod.

I guess that also works and is easier, fair enough.

actually fixed now in v1.10.4