SUMMARY
Since upgrading to 5.19.0, virtual desktops cannot be switched via screen edges, at least not reliably.

I have a setup with 8 virtual desktops (2 rows, 4 each). When I move the mouse cursor to a corner, the desktop is switched to its neighbour. But not when I move to an edge. If a window is present and I move the mouse cursor to the top edge, the desktop is switched, but this does not work on the other edges (a panel is on the bottom edge).

STEPS TO REPRODUCE
1. Configure a 4x2 virtual desktop layout.
2. Set "Switch desktop on edge" to "Always Enabled"
3. Set a "Activation delay" and "Reactivation delay" of 300ms
4. Move your mouse cursor to any desktop edge while the desktop is empty with just your panel showing

OBSERVED RESULT
Nothing happens.

EXPECTED RESULT
The virtual desktop should be switched according to the triggered edge.

SOFTWARE/OS VERSIONS
Windows: no
macOS: no
Linux/KDE Plasma: Gentoo ~amd64 w/ official kde and qt overlay
(available in About System)
KDE Plasma Version: 5.19.0
KDE Frameworks Version: 5.70.0
Qt Version: 5.15.0

ADDITIONAL INFORMATION