YoutubeTV channel does not always remember what has already been played

I watch Youtube TV on a Roku Express 4K+ and I have noticed that the Youtube TV app does not always mark a show as watched after I have watched it.   I can't seem to find any rhyme or reason why the app does or does not mark a show as watched when I am done.  I was wondering if anyone else has noticed this and if they have any solution to ensure that a show I watched is marked as watched.