I'm seeing the same behavior on cosmic, so not specific to disco.
Feb 18 14:28:23 x230 gnome-software[4674]: no such desktop file:
io.snapcraft.vlc-RT9mcUhVsRYrDLG8qnvGiy26NKvv6Qkd
** Also affects: gnome-software (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects:
** Changed in: gnome-software (Ubuntu)
Status: New => Confirmed
** Changed in: gnome-software (Ubuntu)
Importance: Undecided => Medium
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