Problem with beam export

I haven’t played the game in the last few months, I recently came back and created a new car. On automation itself there are no problem, but the export of the car does not work : the car is half flying, the rear wheels break when spawning the car. The engine works but it is impossible to move the car, the wheels seam to be stuck.
It seams like the rear wheels are not placed where they are suppose to be

I’m playing in the experimental branch / open beta

the .car file and the export, plus some screenshots are in the following drive: