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An incompatible change was made in #178991 and friend modules were not correctly updated: org.netbeans.modules.contrib.testng.output.TestNGExecutionManager is not abstract and does not override abstract method enabled(org.netbeans.modules.gsf.testrunner.api.RerunType) in org.netbeans.modules.gsf.testrunner.api.RerunHandler public class TestNGExecutionManager implements RerunHandler {
It's my fault I have not updated the TestNG module according API friend change. I will fix it.
Fixed in the main/contrib (changeset: f5bc50e48ce3).