clone/download jbosstools-quarkus from  https://github.com/olkornii/jbosstools-quarkus/tree/JBIDE-28167_test_branch (there are disabled all tests except one we need and added sleep time in right moment) -> open jbosstools-quarkus/itests/org.jboss.tools.quarkus.integration.tests/ -> run command "mvn clean install -PITests -Pdownload-devstudio" -> wait while "testmvn" project will be created -> open "Problems" view -> error is here -> open pom.xml -> edit something (for example: add empty line) -> save -> wait 5-10 seconds -> error disappears -> right click on project -> Run As -> Run configuration -> Quarkus Application -> Run -> see error in console output