Chapter 2: Bridging Combine Publishers to async/await

📚 Official Books Combine: Asynchronous Programming with Swift
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Why does this code snippet produces different results?

example(of: "async/await") {
  let subject = CurrentValueSubject<Int, Never>(0)

  Task {
    for await element in subject.values {
      print("Element: \(element)")
    }
    print("Completed.")
  }

  subject.send(1)
  subject.send(2)
  subject.send(3)

  subject.send(completion: .finished)
}

Sample runs
Run 1:

——— Example of: async/await ———
Element: 1
Element: 2
Element: 3
Completed.

Run 2:

——— Example of: async/await ———
Element: 0
Element: 1
Element: 2
Element: 3
Completed.

Run 3:

——— Example of: async/await ———
Completed.

I sometimes get different results. Why?