SUMMARY
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The error manifests itself on Windows version and Linux AppImage version (I use Linux Mint as alternative):
Changes in settings of keyboard shortcuts are saved in configuration files, but after restart of digiKam keyboard modifications aren't applied (can be activated manually).

STEPS TO REPRODUCE
1.  change definition of (any) keyboard shortcut (for example "Assign Pick label Accepted" from "Alt+3" to "S"
2. save changes
3. close digiKam
4. open digiKam
5. new schortcut is not active. I can activate it by clicking: ManageSchemes -> Current Scheme: Default (and changes will be loaded)

OBSERVED RESULT
see upper

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: Windows 10, 22H2,  19045.2965
macOS: 
Linux/KDE Plasma: Linux Mint 21.1
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION