I have created some layouts in "custom size & position" and enabled them as snap targets, this works well and i can drag my window to get the area displayed and resize the window.
However, I have two displays and i want a different layouts available for each one. If i enable the "Destination Display" option for the custom size & position, it no longer shows up as a snap target on any display.
My ideal behavior would be that this makes the snap target only appear in the "destination display". That way i could have different snap layouts for each display. Worst case scenario it should at least warn you that selecting a destination display and snap target settings together is not compatible.