Fixed issues with Z correctness when NPCs are pathing on normal grids

Fixed issues with Z correctness when NPCs are engaged with players following
NPC corpses should fall into the ground far less

zone/mob_ai.cpp

@@ -991,6 +991,9 @@ void Mob::AI_Process() {
 
 	if (engaged) {
 
+		if (moving && fix_z_timer_engaged.Check())
+			this->FixZ();
+
 		if (!(m_PlayerState & static_cast<uint32>(PlayerState::Aggressive)))
 			SendAddPlayerState(PlayerState::Aggressive);
 		// we are prevented from getting here if we are blind and don't have a target in range