behave_screen_edge only works with certain open windows

[ThomasSeeker]

Hello there,

If I run xdotool behave_screen_edge left \ exec beep, it only functions, when certain windows are opened and maximized (e.g. Firefox and Thunderbird).

If no window is raised and the desktop is empty it never works.
If I change the parameter to top it works with all those maximized windows which use a regular title bar. But not with others.

Why is this? Is this a bug?

PS: I am running it on Kubuntu 23.10.