"Failed to register AppImage in system via libappimge"

Pre-submit checks

• I checked for similar issues beforehand, but could not find any, not even closed ones. I could not add my bug report to any existing issue.
• I am going to take the time to to fill in all the required details. I know that the bug report will be dismissed otherwise.

Describe the bug

I am trying to install the app image from here https://github.com/martinrotter/rssguard/releases specifically https://github.com/martinrotter/rssguard/releases/download/devbuild5/rssguard-devbuild5-90ef2a498-qt6-linux64.AppImage and when I open the AppImage I then click "Integrate and Run" and then I get the error " failed to register AppImage in system via libappimge".

Expected behavior

I expected to be able to install the AppImage successfully.

Steps to reproduce the issue

1. Go to https://github.com/martinrotter/rssguard/releases
2. Download: rssguard-devbuild5-90ef2a498-qt6-linux64.AppImage
3. Click on the AppImage once downloaded
4. Click "Integrate and run"
5. See if you are successful or not 6

Screenshots

Distribution and desktop environment

Ubuntu 24.04.3 LTS Kernel: 6.14.0-33 64Bit Desktop

Installed AppImageLauncher version

v3.0.0-beta-3 96cb937 Release v3.0.0-beta-3

List of AppImages you tried (ideally with URL)

RssGuard (not working) https://github.com/martinrotter/rssguard/releases/download/devbuild5/rssguard-devbuild5-90ef2a498-qt6-linux64.AppImage YouTube Music (working) https://github.com/pear-devs/pear-desktop/releases/download/v3.11.0/YouTube-Music-3.11.0.AppImage

Additional context

N/A