Thx @Chelsea_Ring
Well. I double checked. And double checked again. It doesn’t.
Opening from notification or from the app without notification does not make any difference. In both live-view and in event history timeline the video goes to full screen landscape mode. I took some screen recordings, but I can’t show them, because when entering the full screen mode the recording stops. Which kind of proves my point.
I’m on a Redmi Note 8 Pro.
My wife is on a Motorola G8. She doesn’t have this issue though.