Just encountered this (didn't pay attention at the beginning so I don't have exact cookie / URL information):

• go to https://hu.wikipedia.org/wiki/Speci%C3%A1lis:BotPasswords
• get redirected to the auth domain with a "your central session expired" message
• enter password + 2FA
• still on the auth domain, now with the normal reauthentication message ("You need to log in again...")
• need to enter password + 2FA again