There are actually 2 bugs here:

1. Simply add this EH:

addMissionEventHandler ["EntityCreated", {
	params ["_obj"];
	systemChat format ["added %1 %2", getObjectID (_obj), typeof _obj];
	
}];

Then using Zeus, simply move the unit into a vehicle, then move him out (or order him to get out). The EH will trigger. It also triggers if you delete the vehicle while the unit is inside.

2. Every time you delete a unit on foot, the EntityCreated EH also registers a logic object immediately in the next frame for some reason (might not be a bug tho)