iOS 10.

I'm seeing some odd behavior where occasionally collection view cells are drawn 
on top of their section header view instead of behind it. When I use the view 
inspector in Xcode then I do, in fact, see the cells in front of the section 
header.

These are pretty generic cells that contain an image. The only thing special is 
that the image is loaded asynchronously and then set on the cells UIImageView 
in a completion block on the main thread.

Has anybody else run across this behavior before?


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