RealtimeWYSIWYGEditorIT#syntaxChange is flickering

expected: <true> but was: <false>

org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
	at org.xwiki.realtime.wysiwyg.test.ui.RealtimeWYSIWYGEditorIT.syntaxChange(RealtimeWYSIWYGEditorIT.java:2291)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)