Service Task is not overwriten when uploaded again

Create a Service Task using the archetype Build as is, keep the resulting JAR, called here custom-workitem-args.jar Change the Work Item Handler definition - remove any parameters Build again, keep the JAR, called here custom-workitem.jar Go to Service Task Administration, upload the custom-workitem-args.jar using Add Service Task button Enable the Service Task Go to a Project > Settings > Service Tasks, Click Install near the Service Task added above. A form should appear, cause custom-workitem-args.jar contains WIH with parameters Cancel the installation Go back to Administration, remove the Service Task Upload custom-workitem.jar (without parameters), enable the Service Task Go to project again, Click Install near the Service Task No form should be presented - but there is the one for the old Service Task.