mission editor's trigger action bug

If you have a plane/helicopter that is not AI with the late activation box checked and set a condition for it in the triggers list it simply wont activate even if the condition is fulfilled.

Example:

Say there is an airbase that belongs to the blue side. The red side can capture it by destroying all the defending ground forces around it belonging to the blue team. That's the condition "Group Dead" = "defending units" then the placed red planes/helicopters on that airbase must be activated so red players can use it to spawn there.

It's an old bug/problem that is stilll awaiting some fixing. Unless I've overlooked something?