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Glad it helps you :)
If this helps. I also encounter this problem last night, and I just did Assets/Reimport All and the error just gone.
Assuming that your car will be at the same position in z axis. Try use Physics2D.Raycast with direction at Vector3.zero.
Try to add all of your cube objects you want to check to a collection at the start of the game, and when you destroy your cube object you want to...