Look behind the toolbar. The first visible item disappears as soon as it goes partially out of the screen

Same is true for normal RecyclerView. I can see it on some of OS Settings screens like list of installed apps on my Pixel phone. I have a 2 button nav and it looks similar when items enter the screen at the bottom. I can see them appearing through partially translucent nav bar.

With a normal recyclerview I don't get that behaviour

Notice how items are appearing on the bottom of the screen behind the nav bar. Yeah I’m not saying it’s fine, but it might be an incorrectly used API.

I think it's worth to open an issue. I'll do it as soon as possible