Created attachment 141891 [details]
a screenshot of the top right of kickoff with breeze dark style applied

SUMMARY
It appears "correntColor" was applied to the bottom right section of plasmoidheading.svgz instead of "currentColor," resulting in Breeze dark missing part of the white separating line in the header's of plasmoids.

STEPS TO REPRODUCE
1. Switch theme to Breeze Dark
2. Open Kickoff
3. 

OBSERVED RESULT
At the furthest to the right of the top line/separator in Kickoff, there will be a dark space.

EXPECTED RESULT
The line in the header should go from left to right completely.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.22.90
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Breeze, Breeze Dark, and Breeze Light are affected, though it is easier to observe in dark, since the line must become white.