Same issue here on 19 Ram 1500. Since day I bought it new in 19. Dealership still has not fixed the problem. They have changed 3rd brake light few times, entire rear glass assembly 3 times, rear antenna, and several cant duplicate leak visits. Trucks 3 years old and still have not got it fixed. No telling how rusty it is on ceiling, rear bulkhead and floor. They just replaced the stained headliner on last visit and now it’s wet again. Fun!