New behaviour of compactMap in Xcode 12.5 beta?

Developer Tools & Services Xcode Xcode

Created Feb ’21

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In Xcode 12.4, the following line of code produces a [String], but in Xcode 12.5 it produces a [String?]:

Code Block let foo = "foo"
let bar = "bar"
let empty = ""
let items = [foo, bar, empty].compactMap { $0.isEmpty ? nil : $0 }

Code Block
let foo = "foo"
let bar = "bar"
let empty = ""
let items = [foo, bar, empty].compactMap { $0.isEmpty ? nil : $0 }

Both 12.4 and 12.5 are using SWIFT_VERSION = 5.0;.

Is this expected?

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