I clipped this so that you can see:
1) The first helicopter is visible
2) I can foam the helicopter so the model / hitbox is there
The second helicopter:
1) Invisible
2) I cannot foam the helicopter because the model / hitbox isn't there
If you look closely, the helicopter flies in after the npcs touch the ground. I've had this happen multiple times. I don't know what causes it.
https://streamable.com/rqlqtu: (https://streamable.com/rqlqtu)