NotificationsIT#notificationDisplayerClass is flickering

Failed after [10] attempts. Expected: [1] - Latest value received: [0]. Build info: version: '4.21.0', revision: '79ed462ef4' System info: os.name: 'Linux', os.arch: 'amd64', os.version: '4.19.0-16-cloud-amd64', java.version: '17.0.12' Driver info: driver.version: unknown

org.openqa.selenium.TimeoutException: Failed after [10] attempts. Expected: [1] - Latest value received: [0]. Build info: version: '4.21.0', revision: '79ed462ef4' System info: os.name: 'Linux', os.arch: 'amd64', os.version: '4.19.0-16-cloud-amd64', java.version: '17.0.12' Driver info: driver.version: unknown at org.xwiki.platform.notifications.test.po.NotificationsTrayPage.waitOnNotificationCount(NotificationsTrayPage.java:128) at org.xwiki.platform.notifications.test.ui.NotificationsIT.notificationDisplayerClass(NotificationsIT.java:373) at java.base/java.lang.reflect.Method.invoke(Method.java:568) 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)