Use As traction in VehicleWheel node(s) seems not to affect vehicle movement ,why?

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:bust_in_silhouette: Asked By xlxs

I have a test scene like this

and the car scene

for all wheels the option “use as traction”, is disabled, but when I run the game all 4 wheels seem to be affected by the engine (in an other test case, i enabled use as traction for the front left wheel, and the vehicle moved again straight forward, like all wheels are affected by engine force)

Extra info that propably doesn’t matter :
1) this happens both with godot, and both with bullet as a physics engine
2)used the gltf format for the car with kronos exported
3) in the script I setted engine_force to a number when for example up is pressed

Any suggestion is welcomed :)

(Also Im new to the engine so I might miss something fundamental.)