FWIW, on my 2021 Refreshed S (Long range), I had a similar rattle but it turned out to come from two places. The loudest rattle came from the carpeted panel on the hatch itself, located below the hatch center speaker grill. It had come loose and rattled. Seems it has metal clips and if they don't engage fully, the panel will come loose. Second rattle came from the hidden latch release cable, located on the underside on the driver's side, side panel above the left trunk light. If you stand at the rear of the car, with the hatch open, and look to the left, you'll see a trunk light. On the carpeted panel above that is a small cutout and inside is an "eye" connected to a release cable. The hold down bracket on mine wasn't tightened properly. Hope this helps