> search paths /snap/chromium/1961/gnome-platform/usr/lib/x86_64-linux-gnu/dri
seems to confirm my suspicions: the snapcraft desktop extension sets the value of LIBGL_DRIVERS_PATH to a single path within the gnome platform snap, thus preventing mesa from locating nvidia-drm_dri.so elsewhere.
> search paths /snap/chromium/ 1961/gnome- platform/ usr/lib/ x86_64- linux-gnu/ dri
seems to confirm my suspicions: the snapcraft desktop extension sets the value of LIBGL_DRIVERS_PATH to a single path within the gnome platform snap, thus preventing mesa from locating nvidia-drm_dri.so elsewhere.