Custom launcher disappeared until reboot
I have a ZenFone 8 with Android 12. I use the Nova launcher (which I'd link, but the forum is not letting me). After the phone had been on overnight, charging and whilst I was sleeping, somehow the launcher got disabled; I was back to the stock Asus launcher. Upon rebooting, Nova was back. Generally, Nova works fine on the phone.
Can anyone shed any light? I had been messing around both with Google's clock app (called 'Clock') and the Asus one (also called . . 'Clock'). Also, I see there are some existing posts in this forum about the Zenfone clobbering Nova
EDITED (fairly heavily).