iOS strange "unable to activate constraint with anchors" error - ios

Question

The ios app I am currently developing starts off on a login screen which then presents the next view controller via a login button. Upon moving on to the next VC I get the error:
Terminating app due to uncaught exception 'NSGenericException',
reason: 'Unable to activate constraint with anchors
<NSLayoutYAxisAnchor:0x600000d0af40 "UIStackView:0x7fe87df14160.top"> and
<NSLayoutYAxisAnchor:0x600000d0ad40 "UILayoutGuide:0x600002102300'UIViewSafeAreaLayoutGuide'.bottom">
because they have no common ancestor.
Does the constraint or its anchors reference items
in different view hierarchies? That's illegal.'
Here is the relevant VC code for the contoller being showed:
let promptLabel: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.text = "Enter Your Location`s \nAddress"
label.font = .boldSystemFont(ofSize: 23)
label.numberOfLines = 0
label.preferredMaxLayoutWidth = label.frame.width
label.textAlignment = .center
return label
}()
let streetAddressField: UITextField = {
let textField = UITextField()
textField.translatesAutoresizingMaskIntoConstraints = false
textField.placeholder = "street address"
textField.borderStyle = .roundedRect
textField.textAlignment = .left
return textField
}()
let cityField: UITextField = {
let textField = UITextField()
textField.translatesAutoresizingMaskIntoConstraints = false
textField.placeholder = "city"
textField.borderStyle = .roundedRect
textField.textAlignment = .left
return textField
}()
let stateField: UITextField = {
let textField = UITextField()
textField.translatesAutoresizingMaskIntoConstraints = false
textField.placeholder = "state"
textField.borderStyle = .roundedRect
textField.textAlignment = .left
return textField
}()
let saveButton: UIButton = {
let button = UIButton(type: .system)
button.setTitle("Add Location", for: .normal)
button.translatesAutoresizingMaskIntoConstraints = false
return button
}()
var currentUser: User?
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
let views: [UIView] = [streetAddressField, cityField, stateField]
let stackView = UIStackView(arrangedSubviews: views)
stackView.axis = .vertical
stackView.spacing = 17
stackView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(promptLabel)
view.addSubview(stackView)
view.addSubview(saveButton)
promptLabel.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
promptLabel.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 30).isActive = true
promptLabel.heightAnchor.constraint(lessThanOrEqualToConstant: 70).isActive = true
stackView.topAnchor.constraint(equalTo: promptLabel.bottomAnchor, constant: 40).isActive = true
stackView.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
stackView.widthAnchor.constraint(equalToConstant: 300).isActive = true
saveButton.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
saveButton.topAnchor.constraint(equalTo: stackView.bottomAnchor, constant: 30).isActive = true
saveButton.addTarget(self, action: #selector(addLocationTouchUpInside), for: .touchUpInside)
}
What is also odd is that this error does not show up for a while. When testing on different iphone simulators the error takes quite a few runs to show up. Also the error shows up at the #main line in AppDelegate.swift.
I am aware that there are multiple duplicates to this question. However all of them simply did not add their subviews to the superview which I have done here.
UPDATE: I had updated to xcode 13 and stopped seeing this error. Unfortunately it has reared its ugly head yet again on both the simulator and my personal iphone.
UPDATE2: After setting numerous breakpoints It would seem this error appears even before viewWillAppear() is called. Going back to my previous VC right after self.navigationController.pushViewController() is called is when we see the error. (self here referring to the previous VC of course)