Seen so many poor Go Arounds but less since we left the autopilot engaged………
Therein lies a clue. On the B737 the autopilot, single channel, will disconnect when you press TOGA. The A/T will remain in the same state as when TOGA is pressed. Thus, many G/A's (should never be a surprise) are conducted in manual pitch & lateral control. If the A/T is not in use that can add a further complication; and if it is in use in can cause an added confusion. B757/767 is too long ago to remember, but I suspect an autopilot G/A was only from a triple A/P approach.