I've reported the issue after the main update but I don't think they care at all. I guess the thumbnail problem and some other glitches will be around for a while. I'm going to use One Note if they don't fix these problems soon. I was really enjoying the app before the update. It is really disappointing they ruined people's notes for just a few good features. Darkmode, superscript and subscript buttons are good features but considering some of my notes turned into html files and thumbnails of my slides are no longer available, consequences of the update are much more than the advantages.