The check with baseline seems broken to me as it does not seem to work with features. When feature.source is checked, the baseline artifact (feature.source.jar) is compared to the wrong artifact (feature.jar).
I reproduced the problem by updating jbosstool-central root POM (only the parent POM version has been changed) and the mvn verify build failed on org.jboss.tools.maven.feature. The output can be seen in one of the PR check