Node bound to object property fails when the property in the object is deleted.

Describe the bug See the title above. For instance the code below fails when the button is clicked.

<script>
     let items = [
          {number: 1, node: null}
     ];
</script>
<p bind:this={items[0].node}>
     {items[0].number}
</p>
<button on:click={()=>items = []}>Delete</button>

There multiple ways the above pattern fails outlined in the REPL below. However, they’re all in the same class of bugs. https://svelte.dev/repl/96355b3f8a45421086f3a4dd0a7163f5?version=3.12.1

Ingore the fact that there are two “App.svelte” files in the REPL above. The code’s the same in both. It’s related to a REPL bug that I’ll file in a separate issue in a bit.

[Conduitry]

I think #3211 was the first place it came up.

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