Empty .jar produced after build

I suddenly started seeing an almost empty .jar generated for xwiki-core. This is caused by the fact that the execution of the maven-jar-plugin that generates a test archive does not have an execution id, thus the settings for that execution are also used by the default jar execution, thus filtering out all files except AbstractBridgedXWikiComponentTestCase.class, which actually isn't among the class files, so I get a jar with no class files.

I don't know why this didn't happen before, perhaps some maven component was changed.