Admin Authentication password popup broken after NC11 > 12

I am unable to after successfully logging in as Admin perform admin activities due to this Action Requires Password popup which is broken, and of course fails to provide any debugging nor log entries…

Not the only glitch upgrading nc11 > 12…
NC12 should have not been pushed on stable users, and remained in beta channel… wtf

Do you use 2FA? Can you check the browser console for errors?