I’ve got the same problem!
Thanks for pointing out that it disappears when selecting an item on the desktop.
I had nothing on my desktop, but once I put something I can confirm it works.
I removed it using other multi-finger gestures (4 and 5 fingers).
But, I cannot do it successfully every time.
I’m not sure what triggers it to exit out of the “selection” state.
kwin_wayland --replace & also does the trick, but it’s by no means a solution.
System Info:
Lenovo Yoga 7
OS: Manjaro Linux x86_64
Kernel: 6.1.90-1-MANJARO
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Graphics Platform: Wayland
Graphics Processor: AMD Radeon Graphics
Processors: 12 × AMD Ryzen 5 5600U with Radeon Graphics
Memory: 16 GiB of RAM