I've had this behavior for a few builds now and figured I should mention it since I haven't seen anyone else report it. On first open of a chapter image menu, either when looking at the media item detail page or the push-up chapter menu, the 5th and 6th chapter images are always blank. If I scroll past them off the screen and then back they show up as expected. No issues on the web app so it seems to be an android tv problem as far as I can tell.
Pop-up chapter menu: