Created attachment 164488 [details]
Text copied from bug report dialog.

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1. Open Palette Editor; click button to "Add a swatch group."
2. Enter swatch group name; click "OK."
3. Click "OK" in Palette Editor dialog.
4. Click disk icon to save palette.
5. Close Krita; launch from 5.2.0 appimage and repeat 1-4.
6. Close Krita; launch from 5.1.5 appimage and repeat 1-4.
OBSERVED RESULT
Using krita-5.2.1-x86_64.appimage, the swatch group is not created. It does not show up in the Palette, and re-opening the Palette Editor shows that the new group does not exist.
Using krita-5.2.0-x86_64.appimage gets same result as with 5.2.0.
Using krita-5.1.5-x86_64.appimage works as expected; new swatch group is created and saved.

EXPECTED RESULT
The new swatch created should show up in the palette and should be visible in the Palette editor.


SOFTWARE/OS VERSIONS
Linux: Pop!_OS 22.04 LTS 64-bit; GNOME v. 42.9; X11
(available in About System)
KDE Plasma Version: N/A
KDE Frameworks Version: N/A 
Qt Version: 5.15.7

ADDITIONAL INFORMATION
See attached file for text box data from bug submission dialog (tried to paste here but it's too long).