I’ve just reported this via Paratext 9 “Give Feedback”, but FYI to all of you until it’s fixed, and assuming it’s not just my laptop:
My Notes pane is usually set to “Unread”. In Paratext 8, after doing a Send/Receive, any new unread notes would automatically appear there. But not now. I have to change some filter (such as “all books” to “this book”, or any other change) in order to make those new unread notes appear.