So there's a bit of a problem at the moment. With the last mod update and the last arma update, when vehicles are damaged, zombies are appearing invisible in the driver's seat. So for instance, if I were to sit in a car and a zombie attacks it, once I get out there will be an invisible zombie ai in the driver's seat. I'm unable to unassign the unit from the vehicle.

I tested this with a bike spawned in as well:
_veh = nearestobjects[player, ["Exile_Bike_MountainBike"],50];
diag_log format["_veh: %1",_veh];
{
_vehicle = _x;
diag_log format["_vehicle: %1",_vehicle];
{unassignvehicle _x;
diag_log format["_x: %1",_x];
}foreach crew _vehicle;

} forEach _veh;
systemchat format["%1",crew (_veh select 0)];

I get:

21:11:58 "_veh: []"
21:12:39 "_veh: [c13f3b00# 1783355: dbo_civ_new_bike.p3d]"
21:12:39 "_vehicle: c13f3b00# 1783355: dbo_civ_new_bike.p3d"
21:12:39 "_x: c12d8f40# 1783501: c_poloshirt.p3d REMOTE"

It always ends up with the c_poloshirt.p3d in the driver's seat. The unassign vehicle doesn't actually kick them out either.

I attempted to change the spawning code for the mod spawning them to try and prevent this behavior, but that's not working either. Currently just doing this to spawn them in isn't preventing the problem:
_unit = _group createUnit [_zClass, _position, [], 0,"FORM"];
[_unit] joinSilent _group;
_unit allowFleeing 0;
_unit disableAI 'FSM';
_unit enableAI 'ANIM';
_unit disableConversation true;
_unit addMPEventHandler ['MPKilled', "_this spawn ZMPKilled;"];
_unit allowGetIn false;
unassignvehicle _unit;

Even better yet, you can't actually do anything with the AI occupying the driver's seat, here's a little more of my attempts to manipulate that AI:
21:52:15 "_veh = nearestobjects[player, ["Land"],50];
diag_log format["_veh: %1",_veh];
{
if !(_x iskindof "CAManbase") then{
_vehicle = _x;
diag_log format["_vehicle: %1",_vehicle];
{unassignvehicle _x;
deletevehicle _x;
diag_log format["_x: %1",_x];
diag_log format["name _x: %1", name _x];
diag_log format["alive _x: %1", alive _x];
diag_log format["type _x: %1", typeof _x];
}foreach crew _vehicle;
};
} forEach _veh;
systemchat format["%1",crew (_veh select 0)];"

21:52:15 "Kobayashi(76561198015614387) | AdminConsole"
21:52:17 "_veh: [R Alpha 1-3:1 (Kobayashi),c9c66c20# 1782445: c_poor.p3d REMOTE,c9c63810# 1782412: coveralls.p3d REMOTE,c9c65220# 1782426: c_orestes.p3d REMOTE,c8622650# 1782464: c_journalist.p3d REMOTE,c8624060# 1782504: c_citizen5.p3d REMOTE,c649c930# 1782408: hatchback_01_f.p3d,O Alpha 1-1:9 REMOTE]"
21:52:17 "_vehicle: c649c930# 1782408: hatchback_01_f.p3d"
21:52:17 "_x: c8625a60# 1782486: c_poloshirt.p3d REMOTE"
21:52:17 WARNING: Function 'name' - c8625a60# 1782486: c_poloshirt.p3d REMOTE has no unit
21:52:17 - network id 2:2360
21:52:17 - person
21:52:17 "name _x: Error: No unit"
21:52:17 "alive _x: true"
21:52:17 "type _x: C_man_1"

I'm sort of at a loss on how to get this fixed right now.