TimeZone(identifier: "Etc/GMT+12") get different results in REPL and Xcode project

In REPL, the result is nil.

  1> import Foundation
  2> TimeZone(identifier: "Etc/GMT+12") 
$R0: TimeZone? = nil

In Xcode Playground,

Swift version is

Apple Swift version 5.3 (swiftlang-1200.0.29.2 clang-1200.0.30.1)

Target: x86_64-apple-darwin20.3.0

Why didn't you use TimeZone on DateFormatter?

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