Published.Publisher does not trasmit successive values when accessed via Mirror API

I'm using the Mirror API to access the underlying publisher of properties wrapped with @Published. For some reason, when setting a published property, values aren't received by the publisher I'm accessing after the initial value.

In the following code, I would expect the "mirrored" publisher to receive events for eternity.

import Combine

class Dinosaur: ObservableObject {
    @Published var angry: Bool = false
}

let raptor = Dinosaur()

//let subscription1 = raptor.$angry
//    .print("NORMAL")
//    .sink { value in }

var published = Mirror(reflecting: raptor).children.first!.value as! Published<Bool>
let publisher = published.projectedValue

let subscription2 = publisher
    .print("MIRRORED")
    .sink { value in }

Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { _ in
    raptor.angry = !raptor.angry
}

But, it only has the following output.

MIRRORED: receive subscription: (PublishedSubject)
MIRRORED: request unlimited
MIRRORED: receive value: (false)

Interestingly, if the let subscription1 = ... line is uncommented, both sinks receive each successive value successfully.

NORMAL: receive subscription: (PublishedSubject)
NORMAL: request unlimited
NORMAL: receive value: (false)
MIRRORED: receive subscription: (PublishedSubject)
MIRRORED: request unlimited
MIRRORED: receive value: (false)
MIRRORED: receive value: (true)
NORMAL: receive value: (true)
MIRRORED: receive value: (false)
NORMAL: receive value: (false)

... etc

It's almost like the compiler has to "see" the magic raptor.$angry to set up a proper subscription.

What am I doing wrong?