AppImage runs but does not display correct logo in Linux sidebar

I ran a Linux app using the AppImage format, and the application itself works fine. However, the app's logo is not displayed correctly in the Linux sidebar (e.g., in the dock or application menu). Instead, it shows a generic or placeholder icon.


Steps to Reproduce:

Download the AppImage file.

Make the AppImage executable (chmod +x appname.AppImage).

Run the AppImage (./appname.AppImage).

Observe the app's icon in the Linux sidebar.

Expected Behavior:
The app's logo should appear correctly in the sidebar, matching the application's branding.

Actual Behavior:
The app's logo is either missing, generic, or incorrect in the sidebar.

Additional Information:

Desktop Environment: GNOME

Linux Distribution: 22.04.5 LTS (Jammy Jellyfish)