100% have the same issue...the dry water shelf accumulation. My buddy worked for as temp driving Tesla's off trucks into lots/deliver centers etc. He's driven 100s if not maybe 1000 different vehicles in his 2 years there and I asked him about it. He told me "unfortunately" the shelf part isn't supposed to be flush, but told me my panel gap on the left side of the trunk was unnaccepable and should be taken care of.Really?? Source [SA or Technician]? Very interesting if so - because it's uneven, after a rain shower or me hosing off the car, water and soot accumulate on the tiny "shelf" in between the bottom of the tailgate and rear bumper and I figure if everything was flush that wouldn't happen. Nothing that a quick swipe with a MF towel can't fix though...
So given how he put it, I didn't doubt him. He said he never saw a flush y right there..have you seen anyone elses flush?