Investigate Wekan test fails for main pipeline

This is just about the last of multiple main pipeline errors tonight. The last pipelines before failed for nextcloud, monitoring and wekan again.

Job #224627 failed for 46ac8952:

Jun 07 08:15:02 00:00:01  ✔ Navigated to URL https://wekan.main.ci.stackspin.net
Jun 07 08:15:12 00:00:10  ✔ Does not exist
Jun 07 08:15:12 00:00:00 AssertionError [ERR_ASSERTION]: false == true
...

Related taiko screenshot (https://open.greenhost.net/stackspin/stackspin/-/jobs/224627/artifacts/file/test/taiko/Screenshot-1654589712290.png):

At around the same time this 499 error shows up in the ingress logs:

213.108.108.138 - - [07/Jun/2022:08:15:01 +0000] "GET /web//auth?login_challenge=a5a1d7e74b0944cdaaa6163a2ef65e14 HTTP/2.0" 499 0 "https://dashboard.main.ci.stackspin.net/web/login" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/102.0.5005.61 Safari/537.36" 71 0.005 [stackspin-dashboard-backend-backend-http] [] 10.42.0.75:5000 0 0.004 - c21214556469ff99e77e65f76bb53972  

So it's very likely directly related to #1292 (closed)