Dunno if it’s just me, but if I try to login through the old.lemmy.world interface it is unsuccessful. I don’t get an error message or anything it just takes me to an blank page at /login
If I go to lemmy.world and log in it works fine, but if I then go back to old.lemmy.world the login does not follow me.
While I’m not seeing a problem, able to login with my World account on either, I can confirm that a login to one will not carryover to the other because each frontend is completely independent.