Not so much a bug as the installer still works. Hopefully, this is in the correct place, feel free to move it Mods.
On the very last screen, after you install the OS, there is a back, next, and done button.
Obviously the Next button does nothing. I didn’t test the Back button, but there’s no point in that button being there either, as you’ve already installed the OS.
My suggestion is to remove both buttons on the last page of the installer.