QMenu custom palette is reset on OSX after menu is opened from other application

Please check the attached example.

How to reproduce it:
1., Click on label, show the menu -> RESULT: Menu has default colors
2., Click on "Change palette" button, then click on label to show the menu again -> RESULT: menu has custom colors (blue text color and red highlighting).
3., Switch to other running application and open its menu
4., Switch back to the example application
5., Click on label, show the menu -> RESULT: Menu has default colors EXPECTED RESULT: menu has custom colors (blue text color and red highlighting).