I have a new 2021 CRV hybrid which has an annoying rattle in the rear. When I first heard it, the day after I bought the car, it sounded like a loose nut in a tank. It’s quite loud and very noticeable. Now that I have had the chance to hear it more, it sounds like something metallic just rocking off balance and the settling back in place. It only happens when I accelerate at low speeds and definitely when I make a right hand turn after stopping. I recorded the sound but the dealer has no clue what it can be and thinks it may be a rock! The metallic nature makes me think it is something else. Has anybody else experienced this?