Okay, that's weird. I checked your account and you're not in the beta update page test, so you shouldn't be seeing that URL at all -- you should still be seeing https://www.dreamwidth.org/update instead. I'll poke at this and see if I can figure out what's going on.

If I need to, can I have permission to log into your account as you and see what exactly is happening in the process? I will use it only for trying to solve this for you and not anything else, and "no" is a perfectly okay answer -- there are a few things I could try that wouldn't involve actually logging in as you -- but it will probably be a lot easier than asking you ten thousand questions back and forth.

EDIT: ha, momijizukamori beat me to it! Yeah, let us know what workflow you're using to update first, I forgot to ask that part.