Fully understand . . . Can always have an issue. That's why there is a warranty.
Took it to the dealer before Christmas. Tech there told me as long as it doesn't throw code or last more than 5 seconds, they really shouldn't do it because it will come back. They told me they'd replace it if I wanted them to, but it will come back and I won't be happy. That's around 6,000 miles now with the noise.
Once the COVID-19 virus calms down, I plan on taking it back and having them replace it. I know you have said in this thread it can't get louder, and you know more about these engines than me, but I can say it definitely has got louder with time. I park in a garage every night, and each morning the noise is there, some days are louder than others.