[Combine]throttle bug?

let subject = PassthroughSubject<String, Never>()

let throttled = subject.throttle(for: .seconds(10), scheduler: DispatchQueue.main, latest: false)

throttled.sink(receiveValue: {print($0, Date())})
    .store(in: &subscriptions)

subject.send("a")
subject.send("b")
subject.send("c")

DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
    subject.send("d")
}

should only output “a”, but why in playground. “d” also can be output.

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