KDE Wayland Display Configuration snap to wrong grid

On several different systems with multiple monitors, Display Configuration (under KDE/Wayland) trying to align monitors, it jumps around to fixed choices (like a snap to grid feature) rather than allowing a smooth variation.

Usually those choices are bad (gap or overlap and/or impossible to align the other dimension). That is especially true when the monitors have different scales.

It usually won’t allow Apply with any gap, so usually the only way to set positions in that GUI is with significant overlap.

I’ve learned, after setting it badly with that GUI, to edit the most recently modified file in ~/.local/share/kscreen/ to change the settings numerically. But various events tend to trash those edits, so I need to redo them.

How is that GUI feature supposed to work. Is the behavior a simple bug or some generally flawed design or what?