AirPods naming and renaming

Hello, guys. I've already posted this post in the communities but Apple removed it and redirected me here.

Got my AirPods yesterday and having kind of an issue with their naming with iPhone 7 Plus running iOS 10.3. It is named "iPhone 7 Plus" as you can see from the screenshot. When I rename the headphones as "AirPods" they stay with this name while I use them. But when I put them back in a case and open it again, they appear to be named by default again. This seems pretty strange to me and I was wondering if this is a beta issue or AirPods issue? Does anyone has the same problem or it's just me?

Will be grateful for any kind of response.