To reproduce:
- Go to Special:MyEvents
- Open the kebab menu (3 dots) for any event
- Click "Close registration"
Expected: It should open a popup
Actual: You're sent to Special:EditEventRegistration, which is the no-JS fallback
Note: there are a couple errors in the console that are likely causing this:
Failed to load resource: the server responded with a status of 400 (Bad Request) VM31:61 {"messageTranslations":{"en":"Mandatory field \"timezone\" missing from request body."},"httpCode":400,"httpReason":"Bad Request"}
Other options in the same menu that require JavaScript are equally broken.