So this happened a while ago, so this bug report is from memory, but this bug appeared so consistently that it’s basically impossible to not remember it.
So, I had a notebook of about like 200-300 pages. With the Nova, since the screen isn’t that huge, this number is actually kinda standard for a semester of lecture notes. However, I always got a bug where, when exporting to a PDF, the progress would hang at like around 80%. I’d get part of the PDF, but I’d always have to go in the thumbnail menu to get the rest, which is annoying, since the thumbnail menu is a big source of a lot of other problems for large notebooks.