How to run code coverage only for Scala targets

I have a project with three targets (among others):

java_library(...)

scala_library(...)

scala_test(...)

Where the scala_library depends on the java_library and the scala_test depends on scala_library. If I run code coverage with this setup, if will execute that only for the java_library and scala code coverage won't be executed.

If I remove the java_library target, then everything works ok.

There is one solution I found: add "--instrumentation_filter=//*:scala_library" as a parameter when running coverage.
Is there any better way to fix this problem?

Start with the reported three-target setup and the coverage invocation, including --instrumentation_filter=//*:scala_library. Check how coverage selects instrumentation when scala_library depends on java_library; done means Scala coverage runs while the Java target remains present, without relying on removing it.

Written by the indexing model from the issue text.