NotificationsSettingsIT#addCustomFilters is flickering

[ERROR] org.xwiki.platform.notifications.test.ui.NotificationsSettingsIT.addCustomFilters(TestUtils) -- Time elapsed: 38.05 s <<< FAILURE!
org.opentest4j.AssertionFailedError: expected: <false> but was: <true>
	at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
	at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
	at org.junit.jupiter.api.AssertFalse.failNotFalse(AssertFalse.java:63)
	at org.junit.jupiter.api.AssertFalse.assertFalse(AssertFalse.java:36)
	at org.junit.jupiter.api.AssertFalse.assertFalse(AssertFalse.java:31)
	at org.junit.jupiter.api.Assertions.assertFalse(Assertions.java:227)
	at org.xwiki.platform.notifications.test.ui.NotificationsSettingsIT.addCustomFilters(NotificationsSettingsIT.java:705)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)