SubWikiIT#movePageToSubwiki is flickering

Error Message

Expected condition failed: waiting for org.xwiki.test.ui.XWikiWebDriver$$Lambda$934/377046847@3a87f5db (tried for 10 second(s) with 500 milliseconds interval)
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: 'b634042d483f', 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.xwiki.test.ui.XWikiWebDriver
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: 293, moz:profile: /tmp/rust_mozprofilepmYSlp, 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: 8be8d4ed-efd6-45ed-85ec-461...}
Session ID: 8be8d4ed-efd6-45ed-85ec-461b6ab96057

Stacktrace

org.openqa.selenium.TimeoutException: 
Expected condition failed: waiting for org.xwiki.test.ui.XWikiWebDriver$$Lambda$934/377046847@3a87f5db (tried for 10 second(s) with 500 milliseconds interval)
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: 'b634042d483f', 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.xwiki.test.ui.XWikiWebDriver
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: 293, moz:profile: /tmp/rust_mozprofilepmYSlp, 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: 8be8d4ed-efd6-45ed-85ec-461...}
Session ID: 8be8d4ed-efd6-45ed-85ec-461b6ab96057
	at org.openqa.selenium.support.ui.WebDriverWait.timeoutException(WebDriverWait.java:95)
	at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:272)
	at org.xwiki.test.ui.XWikiWebDriver.waitUntilCondition(XWikiWebDriver.java:226)
	at org.xwiki.test.ui.XWikiWebDriver.waitUntilElementHasNonEmptyAttributeValue(XWikiWebDriver.java:434)
	at org.xwiki.wiki.test.po.CreateWikiPage.getComputedName(CreateWikiPage.java:65)
	at org.xwiki.wiki.test.ui.SubWikiIT.createSubWiki(SubWikiIT.java:160)
	at org.xwiki.wiki.test.ui.SubWikiIT.movePageToSubwiki(SubWikiIT.java:102)