If you attach a vehicle to anything, then detach it, you cannot use it. You can get in, but you can't start the engine or drive / fly. Sometimes you can start the engine, but then the physics fuck up, boats sink, etc.
So you cannot make eg. vehicle drops. {F21758}
Video of repro mission: http://www.youtube.com/watch?v=phdoT4T4u8k
@Killzone_Kid: Ignorance is bliss. You're doing it wrong.
This issue has been present since Alpha.
@Killzone_Kid: That statement has nothing to do with the bug.
And like is stated in the description: "Sometimes you can start the engine".
You're just finding ways not to reproduce the bug. Gtfo troll.
I am making a mission where this vehicle drop is sorta needed to actually start the mission... So this would be a nice fix.