When I created a mod with an attempt to use CC-Tweaked as a dependency, it caused Fabric to add the fabric-models-v0 module, even though, to my knowledge, the latest version of CC-Tweaked has moved away from it. Not having the dependency added does not cause the game to refuse to start. I've tried everything I could think of, including clearing Gradle cache system-wide. Fabric seems to add it every time I start the game in development mode. The error does not occur when the mod is not in a development environment. If I could get some pointers to why this is happening, that would be great. Thanks!

Hmmm, as a workaround you can add modImplementation "net.fabricmc.fabric-api:fabric-api-deprecated:${project.fabric_version}" to your build.gradle file for the moment.

We will stop removing deprecated modules from the main artifact as it's causing issues, see #3246.