Okay! Big update.
I checked the same file that was generated earlier after I did the “rematch” trick (the same file I’ve been talking about) and it’s gone! I suspect that it’s because I performed “clean bundles” earlier. I can still see the thumbnail on plex web because that thumbnail still exists in the Photo Transcoder folder. But I checked my phone and it’s blank! So if I clear the thumbnail cache it would be blank again on plex web. So, all this time when I thought I “fixed” it, it was still broken as soon as maintenance was performed. I just assumed it worked, but I was looking at the cached image.
I checked the database and that entry for that file that used to work is still there. So the problem, for some reason, “cleaning bundles” is deleting the thumbnails.
I don’t actually know how to fix it now because there’s no use doing the plex dance either because I’ve done that many times before and it still keeps happening.
