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SUMMARY
I cannot create groups in the palette, once I create it and click "ok", a uniform palette without groups appears

STEPS TO REPRODUCE
1. Click in "edit current palette" 
2. click "add a swatch group" 
3. create a palette ond click "ok"

OBSERVED RESULT
nothing happend, just a uniform palette without groups is created

EXPECTED RESULT
formation of groups in the palette

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION