SUMMARY
When the Minimize All widget is clicked twice, the first time the windows are minimized (as should be), and the second click opens a different activity.
This is super inconsistent, it seems to happen based on what you most recently changed. As an example, if I recently changed between activities, it'll go back to the previous activity. If I changed virtual desktops, it'll change virtual desktop. And sometimes it'll do nothing at all and work like it's supposed to.

STEPS TO REPRODUCE
1. Pin Minimize All to panel
2. Click once
3. Click again

OBSERVED RESULT
The second click opens the different activity/virtual desktop

EXPECTED RESULT
The second click should un-minimize the windows in the current activity that were minimized in the first click.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.23
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.3
Graphics Platform: X11

ADDITIONAL INFORMATION
none