Reactive statement two way binding bug

[NikolayMakhonin]

see this repl

<script>
	let obj = {};
	function objToState() {
		console.log('objToState')
		state.bool = obj.bool
	}

	let state = {};
	function stateToObj() {
		console.log('stateToObj')
		obj.bool = state.bool
	}
	
	$: obj && objToState()
	$: state && stateToObj()
	// $: obj && objToState()
</script>

<input type="checkbox" bind:checked="{state.bool}" /><br>
<input type="checkbox" bind:checked="{obj.bool}" /><br>

If I click the stateToObj checkbox, I see this in the console:

"stateToObj"
"objToState"

It is correct

But if I click the stateToObj checkbox, I see only this:

"objToState"

It is incorrect, I expect to see the same log

It turns out that in order to implement two way binding of obj with state, I need to add another line (which is now commented)

Information about your Svelte project:

• Your browser and the version: Chrome 88

• Your operating system: Windows 7

• Svelte version: 3.32.3

[Conduitry]

This is intended behavior. See my explanation in #5848.