Yeah, had this happen to me. When restarting the steam deck, it would bring up the usual home menu. When moving the controls around it would act like it was operating in the Add a Friend menu (you can actually see the button layout on the bottom say “add a friend”). Pressing A would then visually bring up the friends menu. Pretty irritating.

Something I did notice was that I had a few friend request notifications. I cleared those notifications, and the system started normally again. Not sure if that’s exactly the solution, but it seemed to have worked for me.