Same problem here in French "Bug" démarrage Samsung Galaxy S9
Translated with deepl it looks like this:
Just a quick question for those of you who own a Samsung Galaxy S9 (android 10 /dev V1.1) :
When booting or restarting, I noticed two minor malfunctions. Namely:
the fast battery charge option is automatically activated even when it was initially disabled.
the proximity sensor to move the hand in front of the screen (in order to display the time for example without "waking up" the phone completely) does not work anymore. I have to reactivate it every time.
The notification sound is disabled when it was not before (phone in vibrate mode but with notification sound not linked to the phone sound). I have to activate it manually.
Have you also had this kind of small problem? It’s not a big deal, but it’s just a matter of getting your feedback.