gap between screen and metal frame on iPhone 7 plus

Hello, My Iphone 7 plus (Jet Black) has a tiny gap between the edge of the screen and the metal frame.I can see dust filling in the gap. The gap size is about I can put a thin paper in it. My phone is brand new out of the box and never drop or repair.

I search on internet and found that many people have this problem too. But, recently, no-one can confirm that this defect affect water resistance or not.

Here is the link

https://forums.macrumors.com/threads/iph...

My iPhone 7 plus has a gap on top and along the right side.

I did search on ifixit.com and found that there has a gasket seal along the edge but I'm still not sure this case (the gap) will have any affect on the gasket seal or not.

Please help me confirm about the water resistance on this case. and it will be great if you can post some closeup pictures about where the gasket seal sitting on and how it attach to the screen.

Thanks you so much in advance.