For an entirely different reason having to do with a poor design of slat track and lever , on the first or second 767 flight, the LE slats jammed on on side. result was the landing at paine field was at a much higher speed than planned
Hi, not familiar with that one, however typically when a flap/slat problem occurs, the asymmetry protection kicks in, the flap/slat(s) gets frozen together with the set(s) on the other wing resulting in a slight asymmetry, and the approach speed is increased 10 knots or so to improve controllability (more aileron authority) and sometimes compensate for lost lift.
now when you lose the whole leading edge device (especially an outboard slat) and the one on the other wing is still attached, that’s something completely different. Again, who am I to argue with FAA, but personally I would be more worried about uncontrollable roll.