- Open a private browser window
- Go to https://deployment.wikimedia.beta.wmflabs.org/wiki/Special:UserLogin
- See that no Captcha is displayed; request triggers a 503 error (Request via deployment-cache-text04 deployment-cache-text04, Varnish XID 1270177689)
This was brought up on en.wp's VP, effectively blocking not-yet-registered users from trying the new wikitext editor.
It seems to be not the first time this problem appears.