I too just noticed my 2019 26600 miles leaking but it’s not the middle slider as it leaks in the corners, mine is a lease so it certainly should be covered. I’ll find out shortly As I have it scheduled for the 19th will follow up.
Just slider windows that I know of… I don’t see a crack in the plastic surround but I put a microfibre cloth behind the headrests inside and tucked a line of 1/2in poly foam caulk saver into the space outside between the top of the rear window and the roof spoiler… not sure where the water is getting in exactly, but it’s very minimal. Too many horror stories and bad experiences with service departments to have any faith in the problem getting resolved by the dealership. I’m going to troubleshoot this myself since I’m past warranty. There’s a few videos on YouTube showing how to properly reseal everything.