White noise on Airpods Pro 3

I have an AC in my room and it’s pretty loud so sometimes I use my AirPods Pro 2 to block out the noise and they work great. I recently bought the AirPods Pro 3, and while they work fine overall, I’ve noticed they create this very artificial or digital white noise. It’s strange because it only happens when I lie down. I thought maybe the positioning of the AirPods changes when I’m lying down, but even after adjusting them, nothing helps. When I switch back to my AirPods Pro 2, there’s no issue at all. It’s so disappointing! Is anyone else experiencing the same thing? The white noise is so loud that it completely defeats the purpose of ANC!