One of possible causes the nacelles hitting ground is retracting landing gears too early during going around in low altitude. Airbus recommand pilots to retract gears moments late in low altitude because the aircraft will sink initially due to high pass ratio engines. So the scratch on the nacelles do not necessarily mean the pilots plan to make a belly landing. If they do, the Mayday call should be made earlier than the first approach. And that makes sense why the cowling not fallen and no scratch mark in the tail (Because the power comes up momently that the hit not too hard)
Another guess is the same as #170 or #181.
I listen LoveATC 0900Z, no communication about PIA 8303, so the reason ATC initially radar vertor PIA 8303 to turn when they report established on 25L may just because they are obviously too high, not any system failure happenned. And there’s no TOO LOW GEAR warning but Master Warning later, over speed is the most possible. High speed means high descend rate, if PM retract gear during bouning what we see happens.