With the latest Snapd update 2.36.2 it got a function which run an update for fontconfig cache after it installing a snap

• Changelog:
  • snapstate: update fontconfig caches on install

This does not work at the moment on solus and you have to run usysconf run fonts -f to get rid of the error

Example: chromium snap
( For testing install chromium with snap install chromium --channel=stable/core16 due an upstream issue link

after install and start over terminal

main.go:224: cannot change mount namespace of snap "chromium" according to change mount (/snap/gtk-common-themes/818/share/icons/Suru /snap/chromium/538/data-dir/icons/Suru none bind,ro 0 0): cannot use "/snap/gtk-common-themes/818/share/icons/Suru" as bind-mount source: not a directory

this will be gone after I run the usysconf command above .

The snapcraft commits Link