UserChangePasswordIT#changePasswordWithTwoDifferentPasswords is flickering

org.openqa.selenium.StaleElementReferenceException: 
The element reference of <span class="LV_validation_message LV_invalid"> is stale; either the element is no longer attached to the DOM, it is not in the current frame context, or the document has been refreshed
For documentation on this error, please visit: https://www.seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: '2425844b3351', ip: '172.17.0.2', os.name: 'Linux', os.arch: 'amd64', os.version: '4.19.0-16-cloud-amd64', java.version: '1.8.0_282'
Driver info: org.openqa.selenium.remote.RemoteWebDriver
Capabilities {acceptInsecureCerts: true, browserName: firefox, browserVersion: 89.0, javascriptEnabled: true, moz:accessibilityChecks: false, moz:buildID: 20210527174632, moz:geckodriverVersion: 0.29.0, moz:headless: false, moz:processID: 302, moz:profile: /tmp/rust_mozprofilevNj1qL, moz:shutdownTimeout: 60000, moz:useNonSpecCompliantPointerOrigin: false, moz:webdriverClick: true, pageLoadStrategy: normal, platform: LINUX, platformName: LINUX, platformVersion: 4.19.0-16-cloud-amd64, setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: ignore, webdriver.remote.sessionid: 730713a5-131e-4b11-9173-aae...}
Session ID: 730713a5-131e-4b11-9173-aae044ef19e4
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at org.openqa.selenium.remote.http.W3CHttpResponseCodec.createException(W3CHttpResponseCodec.java:187)
	at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:122)
	at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:49)
	at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:158)
	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)
	at org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDriver.java:489)
	at org.xwiki.test.ui.XWikiWebDriver.executeScript(XWikiWebDriver.java:874)
	at org.xwiki.test.ui.XWikiWebDriver.scrollTo(XWikiWebDriver.java:652)
	at org.xwiki.test.ui.XWikiWebDriver.findElement(XWikiWebDriver.java:680)
	at org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:69)
	at org.openqa.selenium.support.pagefactory.AjaxElementLocator.access$001(AjaxElementLocator.java:39)
	at org.openqa.selenium.support.pagefactory.AjaxElementLocator$SlowLoadingElement.isLoaded(AjaxElementLocator.java:165)
	at org.openqa.selenium.support.ui.SlowLoadableComponent.get(SlowLoadableComponent.java:51)
	at org.openqa.selenium.support.pagefactory.AjaxElementLocator.findElement(AjaxElementLocator.java:95)
	at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:38)
	at com.sun.proxy.$Proxy78.getText(Unknown Source)
	at org.xwiki.user.test.po.ChangePasswordPage.getValidationErrorMessage(ChangePasswordPage.java:114)
	at org.xwiki.user.test.ui.UserChangePasswordIT.changePasswordWithTwoDifferentPasswords(UserChangePasswordIT.java:130)