I think Teslas use a regenerative brakes, basically when brakes are applied there is a assembly that will act as a generator and recharge the battery though its not 100% efficient.
Towing the car would not cause that issue. Because simply put
Battery —-> Motor —–> Movement
Battery <—- Motor <—- movement (Not possible)
Battery —–>Generator —->movement (Not possible)
Battery <—–Generator <—–Movement
A generator converts mechanical to electrical based on the build normally brushes creating a magnetic field yada yada yada.
A motor converts the electrical into mechanical energy. A motor cannot act as a generator.
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