Apps from PPAs with AppStream metadata cannot be uninstalled

This happens on the latest Snap Store on fully updated Ubuntu 20.04. When adding a PPA and installing a package from this PPA using apt, the app is correctly displayed in Snap Store if it has AppStream metadata, however when clicking "Remove", nothing happens. Also, the source for this app is displayed as "unknown".

To reproduce this issue, try, for example, installing Lutris:
$ sudo add-apt-repository ppa:lutris-team/lutris
$ sudo apt-get update
$ sudo apt-get install lutris

Then restart the computer or run "killall snap-store", then launch Ubuntu Software again, switch to the Installed tab, click on "Lutris" and click "Remove".

This is in Snap Store verbose log:
15:03:41:0253 Gs remove net.lutris.Lutris
15:03:41:0253 Gs Chaining cancellation from 0x558d9861d6a0 to 0x558d979a5620
15:03:41:0254 Gs nothing adopted system/*/*/desktop/net.lutris.Lutris/*
15:03:41:0258 GsPluginPackageKit ignoring /var/lib/snapd/hostfs/usr/share/applications/net.lutris.Lutris as does not exist
15:03:41:0259 Gs running remove with dedupe-flags=7 with refine-flags=require-setup-action,require-origin with interactive=True with timeout=60 on plugin=snap on apps system/*/*/desktop/net.lutris.Lutris/* took 5ms