modCompileOnly tries to load mod into testmod

[LLytho]

I have modCompileOnly("me.shedaniel:RoughlyEnoughItems-api-neoforge:$reiVersion") in my neoforge gradle. When I start the normal client run, everything works fine but when I start the testmod run, which runs the test sourceset and the main sourceset it seems to try to load the API as mod. I tried other dependencies and they are also loaded.
I also tried the same on fabric which has the same behavior.

https://github.com/AlmostReliable/almostunified/blob/1.20.4/build.gradle.kts#L219-L237
This is how the test runs are generated, nothing special.
So not really sure if thats a bug or I'm just missing something.

Thats the error when running the testmod: