So just to be absolutely clear: you've observed the problem occurring only with the Fujifilm X-H1 camera?
Ensure only the X-H1 is attached. Ensure it is not open (mounted) in any other program, including any Gnome or KDE program. Then from the command line run this:
gphoto2 --list-files
Does this exactly match the file list on the camera's memory cards?
So just to be absolutely clear: you've observed the problem occurring only with the Fujifilm X-H1 camera?
Ensure only the X-H1 is attached. Ensure it is not open (mounted) in any other program, including any Gnome or KDE program. Then from the command line run this:
gphoto2 --list-files
Does this exactly match the file list on the camera's memory cards?