It is normal to switch any two wires on a sensorless system to reverse the direction. This shouldn't be done on the GTB, if nothing else because of the timing on the sensor position.
I don't know if a GTB will run backwards (not very well) by swapping the wires over, so worth checking if yours is simply wired up wrong, like said check the A, B and C phases are wired up correctly as labeled on the ESC and motor.
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