SUMMARY
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Since updating to Plasma 6 (confirmed on 6.0.1 and 6.0.2) right-click on a titlebar no longer shows the additional-actions menu near the mouse.  The menu IS SHOWN, but it is always in the upper left corner of my leftmost display. 
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STEPS TO REPRODUCE
1. Right-click on the title-bar of any primary window

OBSERVED RESULT
Menu appears in near the top of my leftmost display, offset from the upper-right corner by what would be the correct amount if measured from the frame in question.  In other words, it appears like the menu is using the desktop as it's parent, instead of the frame associated with the title-bar.

EXPECTED RESULT
Menu should appear near the mouse

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.0.2
KDE Plasma Version:  6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
I am currently running Wayland