[salawat]

Basically, the new engine nacelle shape and placement contribute extra lift at high AoA. The additional lift in front of the CoG creates a pitching moment that drops the tail, and lifts the nose.

Think of it like attaching an extra conditional lifting surface to the wing. In normal, low AoA flight, no pressure differential is created. At high AoA though, that extra lift works through the lever arm of the nacelle assembly.

Control feelwise, this would result in a slackening of control force needed to yield more degrees AoAby the plane after a certain point. That's a regulatory no-no.