Mod version in fabric.mod.json is not changed from ${version} to the actual version, in this case 3.0 during build.

This will be fixed in next update.

Noticed it while disabling the old version on the MultiMC modlist for my instance, it said ${ on 3.0 and 2.5 for 2.5

Indeed, that's an interesting find, will look for a solutin. Does it say ${version} when it's supposed to say 3.0 in mod menus or something, or how did you notice this?

Oh okay, so this is a new one. Interesting