"Auto select events under cursor" not functioning consistently

Sometimes, I experience “Auto select events under cursor” doesn’t auto-select-events-under-cursor any more after I manually selected an event for editing, or after opening another Nuendo-window…
When I want “Auto select events under cursor” to be functioning again after I’ve selected an event manually, I need to switch it off and on again…
Is this the way it’s designed? Or am I doing something wrong?