SUMMARY
In almost all KDE apps, the dropdown for a menubar item is opened when they are left clicked and dragged, but nothing happens in Kalendar


STEPS TO REPRODUCE
1. Open Okular or some other KDE app with menubars
2. Click on a menubar item, but without releasing the click, keep hovering over the menubar
3. When the dropdown opens, without releasing the click, mouse down to an entry, and release the click
4. The entry is opened
5. Try the same thing with Kalendar

OBSERVED RESULT
The menubar item gets highlighted, but the dropdown isn't opened, nor can you go to a different menubar item by moving the mouse to it (without releasing the click)

EXPECTED RESULT
As in Okular and other KDE apps, where clicking the menubar item without releasing opens the dropdown

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.23
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.3
Kernel Version: 5.11.0-40-generic (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-7200U CPU @ 2.50GHz
Memory: 7.5 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 620

ADDITIONAL INFORMATION
none