When exporting bookmarks (to html), you need to retry many times to export all bokmarks. I mean sometimes it exports 1/2 , sometimes 1/3 of all content.. (Starting from first to x). Need to try 3-4-5-9 times until you have all favorites , including last ones.
I have a lot of bookmarks (maybe that is the reason?) .
tested on laptop and desktop. Windows 10 and 11. Noticed ~2 months ago first time. Updated MX since then many times. (Different MX versions).