Invalidate List SwiftUI - swiftui

Question

Workaround at bottom of Question
I thought SwiftUI was supposed to automatically update views when data they were dependent on changed. However that isn't happening in the code below:
First I make a simple BindableObject
import SwiftUI
import Combine
class Example: BindableObject {
var didChange = PassthroughSubject<Void, Never>()
var test = 1 {
didSet {
didChange.send(())
}
}
}
Then the root view of the app:
struct BindTest : View {
#Binding var test: Example
var body: some View {
PresentationButton(destination: BindChange(test: $test)) {
ForEach(0..<test.test) { index in
Text("Invalidate Me! \(index)")
}
}
}
}
And finally the view in which I change the value of the BindableObject:
struct BindChange : View {
#Binding var test: Example
#Environment(\.isPresented) var isPresented
var body: some View {
Button(action: act) {
Text("Return")
}
}
func act() {
test.test = 2
isPresented?.value = false
}
}
When the return button is tapped there should be 2 instances of the Text View - but there is only 1. What am I doing wrong?
Also worth noting: If I change the #Binding to #EnvironmentObject the program just crashes when you tap the button producing this error:
Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
Full code below:
import SwiftUI
import Combine
class Example: BindableObject {
var didChange = PassthroughSubject<Example, Never>()
var test = 1 {
didSet {
didChange.send(self)
}
}
static let `default` = {
return Example()
}()
}
//Root View
struct BindTest : View {
#EnvironmentObject var test: Example
var body: some View {
PresentationButton(destination: BindChange()) {
ForEach(0..<test.test) { t in
Text("Invalidate Me! \(t)")
}
}
}
}
//View that changes the value of #Binding / #EnvironmentObject
struct BindChange : View {
#EnvironmentObject var test: Example
#Environment(\.isPresented) var isPresented
var body: some View {
Button(action: act) {
Text("Return")
}
}
func act() {
test.test = 2
isPresented?.value = false
}
}
#if DEBUG
struct ContentView_Previews : PreviewProvider {
static var previews: some View {
//ContentView().environmentObject(EntryStore())
BindTest().environmentObject(Example())
}
}
#endif
EDIT 2: Post's getting a little messy at this point but the crash with EnvironmentObject seems to be related to an issue with PresentationButton
By putting a NavigationButton inside a NavigationView the following code produces the correct result - invalidating the List when test.test changes:
//Root View
struct BindTest : View {
#EnvironmentObject var test: Example
var body: some View {
NavigationView {
NavigationButton(destination: BindChange()) {
ForEach(0..<test.test) { t in
Text("Functional Button #\(t)")
}
}
}
}
}