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Ok - found this which solved it. Now I wonder how one would fix this from the publisher side 😄

If you use

java.withSourcesJar()

- see: https://docs.gradle.org/current/userguide/building_java_projects.html#sec:java_packaging - instead of what you are doing now to create and publish the sources Jar, everything should be correct. If you need something more custom, have a look at: https://docs.gradle.org/current/userguide/publishing_customization.html

Thanks Jendrik! I will go through the guide, learned a lot these days 🙂