async-handler not working / logging.properties incompletely updated

Set up a WildFly 10 or 11 (other versions might be affected, too, but I didn't test). Start this WildFly and deploy sth., i.e. use it normally. Stop the server. Change the standalone.xml file: Rename the regular "FILE" logging-handler to "FILE.sync". Add a new async-handler like this: <async-handler name="FILE"> <queue-length value="512"/> <overflow-action value="block"/> <subhandlers> <handler name="FILE.sync"/> </subhandlers> </async-handler> Start the WildFly again and wait a bit until it updates the logging.properties . Check the logging.properties : Both handlers exist, now, hence it has definitely been written, but: It lacks the sub-handlers for the "FILE" handler. Check the log file: Nothing is logged, anymore. And here the following steps to work around this bug: Stop the WildFly, again. Delete the logging.properties file. Start the WildFly, again and wait for the logging.properties to be recreated. Check the logging.properties and the log file: Now, everything is correct.