Docker tests don't start anymore on ARM64

Caused by: java.lang.RuntimeException: org.openqa.selenium.SessionNotCreatedException: Could not start a new session. Response code 500. Message: Could not start a new session. Error while creating session with the driver service. Stopping driver service: Could not start a new session. Response code 400. Message: unhandledPromptBehavior is not a string: {"beforeUnload":"ignore","default":"ignore"} 
Host info: host: '9ad8556bb014', ip: '172.17.0.4'
Build info: version: '4.20.0', revision: '866c76ca80'
System info: os.name: 'Linux', os.arch: 'aarch64', os.version: '6.12.76-linuxkit', java.version: '17.0.11'
Driver info: driver.version: unknown
Build info: version: '4.20.0', revision: '866c76ca80'
System info: os.name: 'Linux', os.arch: 'aarch64', os.version: '6.12.76-linuxkit', java.version: '17.0.11'
Driver info: driver.version: unknown
Build info: version: '4.41.0', revision: '9fc754f'
System info: os.name: 'Mac OS X', os.arch: 'aarch64', os.version: '14.6.1', java.version: '21.0.9'
Driver info: org.openqa.selenium.remote.RemoteWebDriver
Command: [null, newSession {capabilities=[Capabilities {acceptInsecureCerts: true, browserName: firefox, moz:firefoxOptions: {prefs: {dom.disable_beforeunload: false, remote.active-protocols: 1, remote.events.async.enabled: false}}, unhandledPromptBehavior: {beforeUnload: ignore, default: ignore}, webSocketUrl: true}]}]
Capabilities {acceptInsecureCerts: true, browserName: firefox, moz:firefoxOptions: {prefs: {dom.disable_beforeunload: false, remote.active-protocols: 1, remote.events.async.enabled: false}}, unhandledPromptBehavior: {beforeUnload: ignore, default: ignore}, webSocketUrl: true}
        at org.rnorth.ducttape.timeouts.Timeouts.callFuture(Timeouts.java:68)
        at org.rnorth.ducttape.timeouts.Timeouts.getWithTimeout(Timeouts.java:43)
        at org.xwiki.test.docker.internal.junit5.browser.XWikiBrowserWebDriverContainer.lambda$getWebDriver$1(XWikiBrowserWebDriverContainer.java:90)