I am supposed to design a T flip flop using logic gates without using a clock(asynchronous sequential circuits) and also draw the state diagram. I don't really understand why the output doesn't change from 0 to 1 when there is a transition from B to D in the given figure below, because for the T flip flop the state 11 causes toggle action, doesn't it? Can someone help me figure this out.
Truth table for T flip flop:
