> ++3.0.2 compile

$ exists core/target/scala-3.0.2
-$ exists core/target/scala-3.1.2
-$ exists subproj/target/scala-3.0.2
-$ exists subproj/target/scala-3.1.2

> clean
> ++3.1.2 compile

-$ exists core/target/scala-3.0.2
$ exists core/target/scala-3.1.2
-$ exists subproj/target/scala-3.0.2
$ exists subproj/target/scala-3.1.2
