ImageIT#quickInsertImageThisPage is flickering

org.openqa.selenium.TimeoutException: 
Expected condition failed: waiting for org.xwiki.test.ui.XWikiWebDriver$$Lambda$1917/0x00007fad70cdb428@20de953a
(tried for 10 seconds with 500 milliseconds interval)
Build info: version: '4.40.0', revision: 'b3333f1'
System info: os.name: 'Linux', os.arch: 'amd64', os.version: '6.1.0-37-cloud-amd64', java.version: '17.0.18'
Driver info: org.xwiki.test.ui.XWikiWebDriver
Capabilities {acceptInsecureCerts: true, browserName: firefox, browserVersion: 147.0.1, container:hostname: 519961ec9a73, moz:accessibilityChecks: false, moz:buildID: 20260116091309, moz:firefoxOptions: {prefs: {dom.disable_beforeunload: false, remote.active-protocols: 1, remote.events.async.enabled: false}}, moz:geckodriverVersion: 0.36.0, moz:headless: false, moz:platformVersion: 6.1.0-37-cloud-amd64, moz:processID: 170, moz:profile: /tmp/rust_mozprofileaRoD4v, moz:shutdownTimeout: 60000, moz:webdriverClick: true, moz:windowless: false, pageLoadStrategy: normal, platformName: linux, proxy: Proxy(), se:cdpEnabled: false, se:containerName: 519961ec9a73, se:deleteSessionOnUi: true, se:downloadsEnabled: true, se:gridWebSocketUrl: ws://127.0.0.1:32891/sessio..., se:noVncPort: 7900, se:vnc: ws://172.17.0.7:4444/sessio..., se:vncEnabled: true, se:vncLocalAddress: ws://172.17.0.7:7900, setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: ignore, userAgent: Mozilla/5.0 (X11; Linux x86..., webSocketUrl: ws://172.17.0.7:4444/sessio...}
Session ID: b8124947-ed50-4cd8-a3ff-073a65dd03f2
	at org.openqa.selenium.support.ui.WebDriverWait.timeoutException(WebDriverWait.java:84)
	at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:231)
	at org.xwiki.test.ui.XWikiWebDriver.waitUntilCondition(XWikiWebDriver.java:229)
	at org.xwiki.test.ui.XWikiWebDriver.waitUntilCondition(XWikiWebDriver.java:217)
	at org.xwiki.ckeditor.test.po.RichTextAreaElement.waitUntilContentContains(RichTextAreaElement.java:256)
	at org.xwiki.ckeditor.test.po.RichTextAreaElement.waitUntilContentContains(RichTextAreaElement.java:251)
	at org.xwiki.ckeditor.test.po.RichTextAreaElement.waitUntilWidgetSelected(RichTextAreaElement.java:674)
	at org.xwiki.ckeditor.test.ui.ImageIT.quickInsertImageThisPage(ImageIT.java:649)
	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)