The traction control system monitors wheel speed via the ABS sensors, hall-effect sensors mounted on the hub looking at a chopper ring in behind the brakes on the front and mounted in the diff housing looking at the chopper ring on the differential end of the drive shaft at the rear.
I have no explanation for your experience, UNLESS the TCS strategy permits some speed differences between front and rear axle at low speeds as a threshold of some kind. Only the engineers who calibrated the system would know.
With no error lights in the dash I am guessing whatever happened was within intervention parameters, but who would know ??
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