The respawn module works fine as long as you move the vehicle away from its original spawn.
It does respawn, when the module is activated, where the vehicle originally was, even if it was in a small parking spot.

But if you don't move the vehicle and it becomes destroyed, the module is not correctly respawning the vehicle - it still has (I think) collision issues.

When you check the sample-mission, don't move the hunter. Destroy it where it stands. You will see that the Hunter mostly will be respawned outside of the area. {F22808}