SwiftUI AttributeGraph cycle in playground only

CountingEditorApp.swift

// Put this into an Xcode 12.0 multiplatform app

import SwiftUI

struct ContentView: View {
    @State var text = "Hello!"

    var body: some View {
        VStack {
            TextEditor(text: $text)
            HStack {
                Spacer()
                Text("\(text.count) characters")
            }
        }
    }
}

@main
struct CountingEditorAppApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

CountingEditorPlayground.swift

// Put this into an Xcode 12.0 iOS playground

import SwiftUI
import PlaygroundSupport

struct ContentView: View {
    @State var text = "Hello!"

    var body: some View {
        VStack {
            TextEditor(text: $text)
            HStack {
                Spacer()
                Text("\(text.count) characters")
            }
        }
    }
}

import PlaygroundSupport
PlaygroundPage.current.setLiveView(ContentView())

@mchakravarty experiencing the same in Xcode 12.4, did you ever find out what was the issue?