TV app
I've got a MacBook Pro (16-inch, 2019) running Monterey.
When I run the TV app, and play video full screen, the screen noticeably dims when any non-video elements are displayed. For example, when closed-captioning is turned off, the video displays at normal brightness, but if CC is turned on, then the screen displays the normal brightness when no CC is on the screen, but any time CC is displayed, the whole screen dims.
The same thing happens when I pause the video or move the cursor (bringing up the TV player UI).
I've tried to take some screen shots, but the video comes out all black (while other elements like CC or "Skip Recap" show up over the black image).