Problems auto-start Linux desktop AppImage not happening

Using Bitwarden on: Linux Mint 20 desktop (AppImage), Firefox browser, Android.

In desktop app, Options → Start automatically on login, Start to tray = checked.

Result: There’s an entry in the Linux Startup Applications list ok, however, the AppImage does not auto-start. If I manually double-click the AppImage, then an icon appears in the tray.

(happy to provide screen shots)