Yeah guys, I'm not sure what to tell you. @youtube @teamyoutube is assigning thumbnails to my videos that aren't mine, at all, and it's completely randomized. This is something they have to fix on their end, because I'm just using the default upload settings as always.
If this info helps to ID the issue everything looks good for thousands of my videos on desktop chrome, firefox, and edge. But on mobile(chrome) every thumbnail is wrong.