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You are talking about a different topic, gate sensitivity in quadrants I-IV. It has nothing to do with the fact that the gate voltage is applied between G and MT1.
A schematic picture of the triac structure shows that the voltage between G and MT1 is limited by a diode junctions for both gate voltage polarities.
A schematic picture of the triac structure shows that the voltage between G and MT1 is limited by a diode junctions for both gate voltage polarities.