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after hours of pain and suffering I found out that: 1. I probably can't control that at all, because

SourceDirectoriesImpl

sets the output directory for the generated sources explicitly. Why? No idea, no documentation to be found. 2. Somehow doing

variant.getSources().getKotlin()...

doesn't create an implicit dependency and

variant.getSources().getJava()...

does. Is it because my sources are in java folder? No idea either...