Unfortunately, Apple does not provide a public API for manipulating the Game Center banner, but banner alerts are currently being truncated in the same way on the iPhone X, so Apple is likely to fix any problems with overlapping labels in the upcoming build. It is also worth noting that there is no mention of this issue in the Xcode 9 Release Notes or the iOS 11 GM Seed Release Notes . They probably know, but don't hurt to imagine a radar!
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