AppImageLauncher does not integrate Digikam 8.4.0 AppImage

[rlfschmd]

Pre-submit checks

• [X] 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.
• [X] 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

Exceuting the 'Integrate to system and run' command when first clicking the AppImage moves the AppImage to the desired location but shows the error 'Failed to register AppImage in system via libappimage' after. The AppImage won't show in the menu and no .desktop file is created. Until Digikam 8.3.0 it all worked fine. The Digikam developers sent me here, since they are sure it is an AIL issue.

Trying the integration via Terminal, I receive the following:

$ chmod a+x /home/xxxx/Applications/digiKam-8.4.0-Qt6-x86-64.appimage 
$ /home/rs/Applications/digiKam-8.4.0-Qt6-x86-64.appimage install

AppImageLauncher error: appimage_shall_not_be_integrated() failed (returned -1)
AppImageLauncher error: appimage_is_terminal_app() failed (returned -1)

(process:5399): GLib-CRITICAL **: 10:03:35.339: g_file_test: assertion 'filename != NULL' failed
(process:5399): GLib-CRITICAL **: 10:03:46.030: g_path_get_basename: assertion 'file_name != NULL' failed
** (process:5399): CRITICAL **: 10:03:46.030: Failed to find desktop file path

Expected behavior

Exceuting the 'Integrate to system and run' command when first clicking the AppImage usually moves the AppImage to the desired location and saves an appropriate .desktop file to ~/.local/share/applications/. The app is launchable from start menu then and behaves more or less the same as any other app.

Steps to reproduce the issue

1. Execute the 'Integrate to system and run' command when first clicking the AppImage.

Screenshots

No response

Distribution and desktop environment

Kubuntu 22.04 KDE Plasma Version: 5.27.11 KDE Frameworks Version: 5.104.0 Qt Version: 5.15.3

(Exactly the same issue happens on Mint 21.3)

Installed AppImageLauncher version

AppImageLauncher version 2.2.0 (git commit 0f91801), built on 2022-11-02 23:51:55 UTC

List of AppImages you tried

https://download.kde.org/stable/digikam/8.4.0/digiKam-8.4.0-Qt6-x86-64.appimage (not working) https://download.kde.org/stable/digikam/8.4.0/digiKam-8.4.0-Qt5-x86-64.appimage (not working)

Additional context

No response