InvitationIT.acceptInvitation is flickering

no such element: Unable to locate element: {"method":"css selector","selector":"#register"}
  (Session info: chrome=101.0.4951.41)
For documentation on this error, please visit: https://selenium.dev/exceptions/#no_such_element
Build info: version: '4.1.4', revision: '535d840ee2'
System info: host: 'cff2557393f6', ip: '172.17.0.2', os.name: 'Linux', os.arch: 'amd64', os.version: '4.19.0-16-cloud-amd64', java.version: '11.0.6'
Driver info: org.openqa.selenium.remote.RemoteWebDriver
Command: [024851cbca957000c7f8a2978fc1031f, findElement {using=id, value=register}]
Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 101.0.4951.41, chrome: {chromedriverVersion: 101.0.4951.41 (93c720db8323..., userDataDir: /tmp/.com.google.Chrome.W8ndbI}, goog:chromeOptions: {debuggerAddress: localhost:46095}, handlesAlerts: true, javascriptEnabled: true, loggingPrefs: org.openqa.selenium.logging..., networkConnectionEnabled: false, pageLoadStrategy: normal, platform: LINUX, platformName: LINUX, proxy: Proxy(), se:cdp: ws://172.17.0.7:4444/sessio..., se:cdpVersion: 101.0.4951.41, 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}, unexpectedAlertBehaviour: ignore, unhandledPromptBehavior: ignore, webauthn:extension:credBlob: true, webauthn:extension:largeBlob: true, webauthn:virtualAuthenticators: true}
Session ID: 024851cbca957000c7f8a2978fc1031f

org.openqa.selenium.NoSuchElementException: 
no such element: Unable to locate element: {"method":"css selector","selector":"#register"}
  (Session info: chrome=101.0.4951.41)
For documentation on this error, please visit: https://selenium.dev/exceptions/#no_such_element
Build info: version: '4.1.4', revision: '535d840ee2'
System info: host: 'cff2557393f6', ip: '172.17.0.2', os.name: 'Linux', os.arch: 'amd64', os.version: '4.19.0-16-cloud-amd64', java.version: '11.0.6'
Driver info: org.openqa.selenium.remote.RemoteWebDriver
Command: [024851cbca957000c7f8a2978fc1031f, findElement {using=id, value=register}]
Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 101.0.4951.41, chrome: {chromedriverVersion: 101.0.4951.41 (93c720db8323..., userDataDir: /tmp/.com.google.Chrome.W8ndbI}, goog:chromeOptions: {debuggerAddress: localhost:46095}, handlesAlerts: true, javascriptEnabled: true, loggingPrefs: org.openqa.selenium.logging..., networkConnectionEnabled: false, pageLoadStrategy: normal, platform: LINUX, platformName: LINUX, proxy: Proxy(), se:cdp: ws://172.17.0.7:4444/sessio..., se:cdpVersion: 101.0.4951.41, 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}, unexpectedAlertBehaviour: ignore, unhandledPromptBehavior: ignore, webauthn:extension:credBlob: true, webauthn:extension:largeBlob: true, webauthn:virtualAuthenticators: true}
Session ID: 024851cbca957000c7f8a2978fc1031f
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
	at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.createException(W3CHttpResponseCodec.java:200)
	at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:133)
	at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:53)
	at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:184)
	at org.openqa.selenium.remote.TracedCommandExecutor.execute(TracedCommandExecutor.java:51)
	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:567)
	at org.openqa.selenium.remote.ElementLocation$ElementFinder$2.findElement(ElementLocation.java:162)
	at org.openqa.selenium.remote.ElementLocation.findElement(ElementLocation.java:60)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:385)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:377)
	at org.xwiki.test.ui.XWikiWebDriver.findElement(XWikiWebDriver.java:687)
	at org.xwiki.test.ui.XWikiWebDriver.findElementWithoutWaiting(XWikiWebDriver.java:84)
	at org.xwiki.test.ui.po.FormContainerElement.<init>(FormContainerElement.java:54)
	at org.xwiki.test.ui.po.AbstractRegistrationPage.getForm(AbstractRegistrationPage.java:82)
	at org.xwiki.test.ui.po.AbstractRegistrationPage.fillRegisterForm(AbstractRegistrationPage.java:76)
	at org.xwiki.flamingo.test.docker.InvitationIT.acceptInvitation(InvitationIT.java:522)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)