version = 1.11.114344
persistence = 1
gamemode = Unknown
Either situation causes it:
Local EXEC:
_vehicle = createVehicle ["C_Offroad_01_F", position player, [], 0, "NONE"];
clearItemCargoGlobal _vehicle;
Server EXEC:
_vehicle = createVehicle ["C_Offroad_01_F", [14939.6,16491,0.00143814], [], 0, "NONE"]; clearItemCargoGlobal _vehicle;
After vehicle spawn check it's inventory and it will be empty then log to lobby and back again and the vehicle will have 6 x FirstAidKits in it.