spawn and entering vehicle bug

[Unholywow]

                                    player:SpawnAndEnterVehicle( 28605, 1000 );

When you use a npc with gossip code to spawn and enter a vehicle it only has one speed. walking speed. If you change the speed in creature proto it does not change the speed of the vehicle when you enter it. However if you spawn the vehicle via gm command it has the speed you change in creature proto.

:ModifyWalkSpeed()
:ModifyRunSpeed()
does not work also