Xcode 9 issue duplication ('Uncategorized' + i.e. 'Swift Compiler Error')

Question

For reason unknown to me, Xcode 9 started to duplicate some (most) of the issues (errors and warnings both). It adds 'Uncategorized' group in the Issue navigator and also displays each of them twice in the code.

Not like it's critical, but uncomfortable.

The question is, have I unknowingly turned this on somewhere or is this a default behaviour for Xcode 9?

I'm using Xcode 9.1 + Swift 4 currently, but it happened also with Xcode 9 + Swift 3.

Thanks.

Answer 1

This is a bug with the current release of Xcode. A temporary fix for this issue is deleting the Derived Data folder.