As far as I can tell this issue is not related to Mounts broken with kernel 5.2. Besides that, I’ve other snaps using volumes:
~$ snap list
Name Version Rev Tracking Publisher Notes
0ad 0.0.23b-alpha 115 stable osomon -
atom 1.40.1 238 stable snapcrafters classic
core 16-2.42 7917 stable canonical✓ core
core18 20191010 1223 stable canonical✓ base
discord 0.0.9 93 stable snapcrafters -
gnome-3-26-1604 3.26.0.20190830 92 stable canonical✓ -
gtk-common-themes 0.1-25-gcc83164 1353 stable canonical✓ -
mailspring 1.7.1 402 stable foundry376✓ -
odrive latest 76 edge bill-666 -
slack 4.1.1 18 stable slack✓ classic
spotify 1.1.10.546.ge08ef575-19 36 stable spotify✓ -