Vehiclebody3d fall through ground

I have created a model for a vehicle in blender. Whenever I change the imported node3d to vehiclebody3d with Vehiclewheels3d the whole body falls through the ground.

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Does the ground have a collider? What type of node is the ground?

Screenshot 2024-03-28 200432
It works for other models. Maybe my model is bad.

What collision layers does the vehicle have?

The StaticBody3D as well as the vehicle are on layer 1. None of the vehicle or wheel properties were changed. Could it be a a mistake I made in blender? Have set the origin of every wheel to the wheel center. Set every scale value to 1 before exporting.