Created attachment 170474 [details]
Recording showing the bug

SUMMARY
Opening the calendar and clicking the "Previous" or "Next" button jumps three months or years, depending on the view.
So clicking "Previous month" on current date jumps back to March instead of May. Clicking "Next month" jumps to September instead of July.
Same with years in the year or month view. From current year it jumps to 2021 or 2027, depending on which button was pressed.

STEPS TO REPRODUCE
1. Click on the digital clock to open the calendar
2. Click on the "Previous" or "Next" button in the day, week or year view

OBSERVED RESULT
The calendar jumps three months/years instead of one

EXPECTED RESULT
The calendar should show the previous month/year or next month/year

SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
Kernel Version: 6.9.3-zen1-1-zen (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION
Screen recording showing this bug is attached