Xcode – Horizontal UIStackView stretching subview

I have the following playground and can’t figure out why the ImageView width constraing is not being respected and it fills the remaining space on the StackView

import UIKit
import PlaygroundSupport

let view = UIView(frame: CGRect(x: 0, y: 0, width: 500, height: 800))

let imageView = UIView(frame: CGRect.zero)
imageView.backgroundColor = UIColor.red

imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.heightAnchor.constraint(equalToConstant: 40).isActive = true
imageView.widthAnchor.constraint(equalToConstant: 40).isActive = true

let navBarHeaderStackView = UIStackView()
navBarHeaderStackView.distribution = .equalCentering
navBarHeaderStackView.alignment = .center
navBarHeaderStackView.axis = .horizontal
navBarHeaderStackView.addArrangedSubview(imageView)
//navBarHeaderStackView.addArrangedSubview(titlesStackView)

view.addSubview(navBarHeaderStackView)
navBarHeaderStackView.translatesAutoresizingMaskIntoConstraints = false

navBarHeaderStackView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 50).isActive = true
navBarHeaderStackView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 8).isActive = true
navBarHeaderStackView.topAnchor.constraint(equalTo: view.topAnchor, constant: 0).isActive = true
navBarHeaderStackView.heightAnchor.constraint(equalToConstant: 60).isActive = true

navBarHeaderStackView.backgroundColor = UIColor.blue

PlaygroundPage.current.liveView = view