Created attachment 126338 [details]
screenshot when global theme is breeze

STEPS TO REPRODUCE
1. set global theme to Breeze OR set global theme to Breeze and plasma style to Breeze Dark in system settings
2. right click on any icon on desktop, choose "Properties"
3. observe the icons of 'Properties" window in its window decoration, task manager and task switcher (alt+tab)

OBSERVED RESULT
if global theme is breeze,  icon in task switcher is different than the one in task manager and window decoration.
if global theme is breeze and plasma style is breeze dark, "Properties" window has three different icons.
See the attached screenshots please.

EXPECTED RESULT
"Properties" window should have just one icon.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.18.1
KDE Frameworks Version: 5.67.0
Qt Version: 5.14.1