Created attachment 149244 [details]
Sizes and positions of displays

SUMMARY
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Screen edge action on top left corner only triggered on secondary smaller monitor which is on the left. (See image attached.)

STEPS TO REPRODUCE
1. Set up two displays, one of them being smaller. Position the smaller one on the left so that its right edge is in contact with the left edge of the bigger monitor and their bases are at the same level(the top of the left edge of the bigger monitor is isolated, makes no contact with the left display).
2. Via Settings>Workspace>Screen Edges, right click the top left square and assign it an action. 
3. Test the top left corner in the primary (right) display.

OBSERVED RESULT
Action is not triggered. 

EXPECTED RESULT
Action is triggered. 

SOFTWARE/OS VERSIONS
Linux: Arch Linux 5.17.9-zen1-1-zen (64-bit)
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.4

ADDITIONAL INFORMATION
In my previous installation, the "expected result" happened.  I've recently reinstalled my system, I do not recall if I had changed some settings to make it so, but I believe I hadn't.  I did not manage to find the correct component where to post this report, so I posted it in General.