CounterView.swift

import Observation
import OSLog
import SwiftUI

@Observable
class CounterModel {
    init(count: Int = 0) {
        self.count = count
        self.observe() // If I comment out this method, changes due to observation within the view work again.
    }

    var count = 0

    func decrementButtonTapped() {
        self.count -= 1
    }

    func incrementButtonTapped() {
        self.count += 1
    }

    @Sendable func observe() {
        withObservationTracking {
            self.count
        } onChange: {
            self.logger.info("Count changed")

            Task { @MainActor in
                self.observe()
            }
        }
    }

    private let logger = Logger()
}

struct CounterView: View {
    @Bindable var model: CounterModel

    var body: some View {
        let _ = Self._printChanges()
        Form {
            Section {
                Text(self.model.count.description)
                Button("Decrement") { self.model.decrementButtonTapped() }
                Button("Increment") { self.model.incrementButtonTapped() }
            } header: {
                Text("Counter")
            }
        }
    }
}

#Preview {
    CounterView(model: CounterModel())
}