In my experience, YouTube in-video links (those that e.g. show thumbnails of videos and are pointed at by vloggers with their fingers) have been broken in Firefox for years. Not that I complain, I've always been annoyed by those. I think it took me 2 years to realize that after seeing vloggers point at invisible things. I had to double-check in Chrome. (I just assumed that they forgot to add the links when editing.)
Those links don't appear on my Android-based Youtube clients that come with my cable box and Sony TV. The vlogger's hand points to nothing. It's amazing how second-class Youtube on Android TV is, maybe someone at Google hates testing it. I still manage to use it for about 75% of my Youtube usage. My wife and I are definitely going through a Youtube phase, which will probably end when the ads reach a tipping point.