STEPS TO REPRODUCE
1. Insert a photo USB device
2. Use Dolphin to mount instead of digiKam or other

OBSERVED RESULT
the device is mounted to successively higher numbered directories each time it is mounted.
e.g.:

    $ ls -l /run/media/bkorb
    drwxr-xr-x 2 root  root     40 Jul 13 09:29 NIKON-Z7-A
    drwxr-xr-x 2 root  root     40 Jul 13 09:29 NIKON-Z7-A1
    drwxr-xr-x 2 root  root     40 Jul 13 09:29 NIKON-Z7-A2
    drwxr-xr-x 2 root  root     40 Jul 13 09:29 NIKON-Z7-A3
    drwxr-xr-x 2 root  root     40 Jul 13 09:30 NIKON-Z7-A4
    drwxrwxrwx 1 bkorb dev  131072 Dec 31  1969 NIKON-Z7-A5

despite the fact I removed all the NIKON-Z7-A* directories beforehand.
If I unmount and remove the -A and -A[1-4] residual directories,
the next time I mount the drive I'll have all these directories
*plus* an -A6 directory that will be the actual mount point.

EXPECTED RESULT
NIKON-Z7-A

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
KDE Plasma Version:  5.12.8
KDE Frameworks Version: 5.45.0
Qt Version: 5.9.4

ADDITIONAL INFORMATION
This is a new "feature" in an antiquated release.
It only started a few days ago. I will file with the
openSUSE folks, too.