For those that want an answer to the Invisible enemies/vehicle not spawning, here it is:
Your character on the Server Side is stuck in one spot (all other players will see you standing still or floating in one spot). But your character that you can move is only moving Client Side. Since your vehicle is stored on the server, when you enter it and leave it your character on the Server moves to where you got out, because your character can move (server side) from your Vehicle.
When you can't see your vehicle spawn, it's because your vehicle is spawning to your Server Sided self, and not your Client Sided self. If you go back to where you last got out of your vehicle, you can see your vehicle spawn there.
When you are being attacked by "Invisible" Enemies, it's because enemies are stored Server Side, and therefore they are attacking your non-moving Server Sided you. You can see this by going to your last spot you exited your vehicle and see the enemies attacking the air, and your HP/Shields decrease with each hit :/
So in the end, it's caused by your Client Side not syncing with your Server Side... Hopefully they can fix this soon. It is VERY annoying
