NotificationsIT#notificationDisplayerClass is flickering

org.openqa.selenium.TimeoutException: 
Failed after [10] attempts. Expected: [1] - Latest value received: [0].
Build info: version: '4.27.0', revision: 'd6e718d134'
System info: os.name: 'Linux', os.arch: 'amd64', os.version: '5.10.0-33-cloud-amd64', java.version: '17.0.13'
Driver info: driver.version: unknown
	at org.xwiki.platform.notifications.test.po.NotificationsTrayPage.waitOnNotificationCount(NotificationsTrayPage.java:118)
	at org.xwiki.platform.notifications.test.ui.NotificationsIT.notificationDisplayerClass(NotificationsIT.java:395)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)