FlatMap Publisher not propagating finished completion event

Using Swift
1

Hey,

I'm having an issue with the propagation of completion events on FlatMap publishers. If the mapped Publisher sends a failure completion event, it will get send down the stream, but if the event is a finished one, nothing happens.

Here's an example that reflects the issue:

enum SomeError: Error {
    case someError
}

let trigger = PassthroughSubject<String, SomeError>()

let cancellable1 = trigger
    .flatMap { _ in
        Fail(error: SomeError.someError)
    }
    .sink(receiveCompletion: { completion in
        print(completion)
    }, receiveValue: { value in
        print(value)
    })

let cancellable2 = trigger
    .flatMap { _ in
        Empty<String, SomeError>()
    }
    .replaceEmpty(with: "empty")
    .sink(receiveCompletion: { completion in
        print(completion)
    }, receiveValue: { value in
        print(value)
    })

trigger.send("")

The output of this is:

failure(__lldb_expr_80.SomeError.someError)

Is this the expecetd behavior? Or is there a bug on the FlatMap publisher?