Hi.
I have the same setting on "Use my sign-in info to automatically finish setting up after an update".
My build is 22478.1012 which is an update over 22471, which was a clean-install.
This is an Hyper-V VM 2nd gen on a non-compliant hardware host machine.
Everything runs super fast. Task Manager opens up fast and all tabs are full of info. I can open admin Windows Terminal. UAC comes forward instantly.
Hope the information is useful.
If there is anything I must do to reproduce the bug, please let me know. Perhaps I can do it.