Implementing t2dTrigger::onLeave callback

I'm trying to implement the onLeave callback for a t2dTrigger derived object I've created. I've gotten the onEnter callback to work fine but it just doesn't want to call onLeave. Here is the following code:

function levelChangeTriggerZone::onEnter(%this, %object)
{
if( %object == $player )
{
echo("Player entered door zone. Teleports to: " @ %this.levelGoTo);

%object.setLevelChangeTo(%this.levelGoTo);
}
}

function levelChangeTriggerZone::onLeave(%this, %object)
{
if( %object == $player )
{
echo("Player left door zone.");
%object.clearLevelChangeTo();
}
}

Like I said, the onEnter works fine, but the onLeave doesn't (I also successfully implemented the onStay callback aswell). Any ideas?