SUMMARY
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***


STEPS TO REPRODUCE
1. Open system settings, Navigate to Keyboard>Shortcuts>KCalc
2. Try to add "Calc" button as a shortcut to open KCalc
3. Try to add modifier key (Alt, Ctl, Meta) + Calc key as shortuct
4. Add a different keyboard shortcut to launch KCalc (ie, Ctl +1, Meta + Q, etc)

OBSERVED RESULT
2. does not work, nothing is added to the shortcut window
3. the modifier keys show up, but not the Calc key
4. these shortcuts should work

EXPECTED RESULT
2 or 3 should successfully register shortcuts

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: KDE Neon Unstable
(available in About System)
KDE Plasma Version: 5.91.90
KDE Frameworks Version: 5.248.0
Qt Version: 6.6.1

ADDITIONAL INFORMATION
The "Calc" key can be used on a shortcut on Plasma 5.  My keyboard is set to "Generic 105 Key" keyboard on both my Plasma 5 install and my Plasma 6 Beta install.  My physical keyboard is a Dell Precision 7540 laptop built in keyboard.