Had 2017 & now 2019 Pathfinder. Both had large dent appear mid-driver side liftgate. No marks at all, not even dust disturbed. Appears to be caused by hydraulic suction when it closes? On 2017 mechanic said it had to be from contact of some sort. On 2019 was OK one day, parked securely (made comment needed wash to husband) & next morning had dent - dust not disturbed. Dent on both vehicles in exact same location & have pics of both. Any ideas?