Screen time website restrictions not blocking all youtube videos in safari

Hi,

I am trying to setup an ipad to use in a waiting room lobby so that it plays two videos from youtube. I have guided access mode turned on so it can only have safari open, enabled screen time, website restrictions, restrict all websites then added the URLs for the two videos.

The two videos play but so does any other youtube video. All other sites are blocked as expected but I want it to only play the two URLs I entered.

Thanks in advanced!