RealtimeWYSIWYGEditorIT#editSource is flickering

org.openqa.selenium.TimeoutException: 
Expected condition failed: waiting for org.xwiki.test.ui.XWikiWebDriver$$Lambda$1595/0x00007f5accbc9858@6890ab7e (tried for 10 second(s) with 500 milliseconds interval)
Build info: version: '4.21.0', revision: '79ed462ef4'
System info: os.name: 'Linux', os.arch: 'amd64', os.version: '4.19.0-27-cloud-amd64', java.version: '17.0.12'
Driver info: org.xwiki.test.ui.XWikiWebDriver
Capabilities {acceptInsecureCerts: true, browserName: firefox, browserVersion: 131.0.3, moz:accessibilityChecks: false, moz:buildID: 20241011205646, moz:debuggerAddress: true, moz:firefoxOptions: {prefs: {dom.disable_beforeunload: false}}, moz:geckodriverVersion: 0.35.0, moz:headless: false, moz:platformVersion: 4.19.0-27-cloud-amd64, moz:processID: 156, moz:profile: /tmp/rust_mozprofileUlrdxU, moz:shutdownTimeout: 60000, moz:webdriverClick: true, moz:windowless: false, pageLoadStrategy: normal, platformName: linux, proxy: Proxy(), se:bidiEnabled: false, se:cdp: ws://172.27.0.2:4444/sessio..., se:containerName: , se:noVncPort: 7900, se:vnc: ws://172.27.0.2:4444/sessio..., se:vncEnabled: true, se:vncLocalAddress: ws://172.27.0.2:7900, setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: ignore, userAgent: Mozilla/5.0 (X11; Linux x86...}
Session ID: d4b5fd59-0e39-47a2-b915-e079fff546d2
	at org.openqa.selenium.support.ui.WebDriverWait.timeoutException(WebDriverWait.java:84)
	at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:228)
	at org.xwiki.test.ui.XWikiWebDriver.waitUntilCondition(XWikiWebDriver.java:228)
	at org.xwiki.test.ui.XWikiWebDriver.waitUntilElementsAreVisible(XWikiWebDriver.java:330)
	at org.xwiki.test.ui.XWikiWebDriver.waitUntilElementIsVisible(XWikiWebDriver.java:285)
	at org.xwiki.test.ui.XWikiWebDriver.waitUntilElementIsVisible(XWikiWebDriver.java:273)
	at org.xwiki.test.ui.po.BaseElement.waitForNotificationMessage(BaseElement.java:110)
	at org.xwiki.test.ui.po.BaseElement.waitForNotificationSuccessMessage(BaseElement.java:88)
	at org.xwiki.test.ui.po.editor.EditPage.clickSaveAndContinue(EditPage.java:172)
	at org.xwiki.test.ui.po.editor.EditPage.clickSaveAndContinue(EditPage.java:157)
	at org.xwiki.realtime.wysiwyg.test.ui.RealtimeWYSIWYGEditorIT.editSource(RealtimeWYSIWYGEditorIT.java:1439)
	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)