Latest update breaks the UX. Tapping a video in the feed starts playing the video as you would expect but tapping the video while it's playing won't pause it but will toggle the video between the feed view and fullscreen. To pause a video you have to toggle to fullscreen and look for the pause button before the video controls overlay auto hides, imagine you're out in public stuck with a loud video playing. Also viewing the comments on a video will forcefully toggle the UI into dark mode.