I'm having the same issue in my truck. First happened February 2022. Heard sizzling coming from behind the rear seats during rain and with the defroster on, turn defroster off and the sizzling stopped. Checked and sure enough the leak was coming in top right side of my rear window. Took it in under warranty and they resealed it. I got it back and there was urethane everywhere. It was on my paint, on the glass, and the spoiler. I had to take it back for them to clean it all up. Fast forward to now..... I'm getting that rainy day sizzle again. Called the dealer and I'm getting the well it's out of warranty now and you need a new rear window to fix it. I complained, having no faith in the previous repair seeing how the outside looked with sealant all over the place, and they have agreed to split the cost of the new window replacement 50/50. But that's still over $1000 so I'm not sure what to do. Was thinking about doing the reseal myself but not too sure yet.