Was running through some test applications in Xcode's playground using SwiftUI when I ran into some very strange behavior using Observable Objects. swift import SwiftUI import PlaygroundSupport import Combine class Counter: ObservableObject {   @Published var count: Int       init(_ initialCount: Int) {     self.count = initialCount   }       func increment() {     count += 1   }       func decrement() {     count -= 1   } } struct CountersView: View {   @ObservedObject var counter1 = Counter(0)       var body: some View {     CounterView(counter: counter1)   } } struct CounterView: View {   @ObservedObject var counter: Counter       init(counter: Counter) {     self.counter = counter   }       var body: some View {     HStack {       Button { counter.decrement() } label: { Image(systemName: "minus.circle") }       Text("\(counter.count)")       Button { counter.increment() } label: { Image(systemName: "plus.circle") }     }   } } Given the following setup, when you run the playground and start incrementing / decrementing the values, the initial click / action is not updated in the UI immediately. Following the first action, all other actions update the UI accordingly, but the state seems to be behind by 1 value. Example: count: 0click increment* count: 0click increment* count: 1 But under the hood, the class has the value at 2 This is where things get more interesting is if you change the CountersView to have the following body swift var body: some View {     CounterView(counter: counter1) CounterView(counter: counter1)   } Then the UI will work correctly and actually show the real count value and update accordingly. Is this a bug or am I missing something?