Exact same here, frustrates me to no end. They conveniently forget I've already watched some videos and they are shown as unwatched when I clearly remember watching them. Then others which DO show the red bar on the bottom indicating I've watched it, yet they still recommend it to me?!? Sometimes I have DOZENS of these recommendations in my feed. Lately it's been bad enough for me to really consider ditching YT for good.

IMHO, we should be able to select or tune algo on YT, FB, Goo, etc. to serve us content. One algo is not enough for everybody.

Same experience for me the last couple of weeks.