Normally when a video is playing on Quest 2, moving the joystick left or right advances the video a few seconds in either direction. However, if you do this within a couple seconds clicking on the video progress bar, the video will advance several minutes. After a few seconds the controls behave normally. It kind of seems like it is a specific occurrence of a more general bug that causes control inputs to stick from time to time. Clicking on the video progress bar might just be one way to trigger this unintended behavior.
