It's not really an issue, rather an inconvenience, but since some weeks the Fullscreen mode has changed.
Before, when going into Fullscreen in Portrait Mode or Horizontal Mode while watching video, the full screen was used.
Now the upper part around the camera is a black bar, so a portion of screen is not used for video or picture playback.
Can this be changed somehow to the former behavior, as much as I know I didn't change any settings and I never used developer options or anything like that. I got a Pixel 9.