I solved it. You will see lists of videos in the studio in your YouTube account. You’ll open a list of videos you’re having trouble with. Below the main image you have a menu with 3 dots where you select: show unavailable videos. Then just remove the unavailable videos from the list.
I have this problem too. They’re still showing me deleted videos from youtube. I don’t know how to change that. It’s been a few months, so I don’t think it’s going to change.
You can see it here, for example: https://michalnadzitavou.sk/video/
