I find this happening with a range of programs, both normal and Flatpak, for example when I need to save one file after the other building clips with Kdenlive, opening my library folder in Picard or selecting a file to upload with my browser.
What I see is that every time the open/save dialog gets opened it has a bit less height than the previous time. This is annoying because every once in a while I need to resize it because I cannot use a dialog so small.
I suppose this has already been spotted, but I cannot find any report.
I attach a screencast, during which I only use keyboard shortcuts to open and close the dialog: Screencast_20250615_221909.mp4 - Nextcloud