I see something similar but I'm not sure if this is what you meant. When I open system settings, apps, video player I select the settings icon. Auto play next and auto repeat are both off and greyed out.
When I open the gallery app, screen recording or video editor album and select one of the thumbnail images it opens the video file in a preview window. It starts playing the video with the background music muted. It will repeat playing the video until I close the preview screen. If I play the video and reaches the end it returns to the preview screen. I haven't found any way to prevent the repeat play in the preview. I do think it would be a nice option to have.