Icon Dissapearing on Debian-based Linux

When executing the .AppImage installer on Debian-based PureOS, it seems like only a temporary instance is launched. The icon appears on the dock, but in the application list, no icon is shown. Previously, this issue was resolved by navigating to File > Settings > Enable Tray Icon. While this is now enabled, and I have toggled it several times, the only way I can launch the application is to go to the .AppImage file in my Downloads folder each time.

The most puzzling part is that when I launch the .AppImage file, it appears that there’s a cached memory since I only have to enter my password: both my email and 2FA token have been saved and do not have to be entered again.

Any suggestions?