SUMMARY
***
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***


STEPS TO REPRODUCE
1. KDE neon Unstable Edition live media 20220515
2. Go to Appearance settings -> Colors and for the "Use accent color" setting choose "From current wallpaper", from the default value "From current color scheme". For the sake of the example, from color scheme is light blue, from wallpaper is orange.
3. Apply
4. Now click the "Defaults" button
5. Apply

OBSERVED RESULT
The radio button still shows "From current wallpaper" as the current setting, although the accent color is correctly reverted to light blue, so the internal state is actually correct, just the UI for the radio button is not refreshed (proof of this is also that the Default button becomes inactive).

EXPECTED RESULT
On top of the actual accent color being reverted to light blue (i.e. from color scheme), the radio button state should also reflect this, and be updated to select "From current color scheme"

SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.24.80
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.3
Kernel Version: 5.13.0-41-generic (64-bit)
Graphics Platform: X11
Processors: 8 × 11th Gen Intel® Core™ i7-1165G7 @ 2.80GHz
Memory: 15.4 GiB of RAM
Graphics Processor: Mesa Intel® Xe Graphics
Manufacturer: Dell Inc.
Product Name: XPS 13 9305

ADDITIONAL INFORMATION
Closing the System Settings window or moving to any other settings panel and then back to Colors will force a refresh/recomputation of the value of the radio button, making the glitch not visible any longer.

This only affects the new option for From current wallpaper. Radio button state is properly updated in UI for the other two options, From current color scheme and in case of manual user selection (predefined color palette/RGB).