JavaScript Why is this only iterating over odd elements of HTMLCollection?

When using a for...of loop to iterate over an HTMLCollection returned from DOMParser only the odd elements are returned. I don't think this happens with NodeLists or HTMLCollections not created with DOMParser. It also doesn't happen if I convert the HTMLCollection to an array.

Any idea why this is happening?

if (!HTMLCollection.prototype[Symbol.iterator]) {
    HTMLCollection.prototype[Symbol.iterator] = Array.prototype[Symbol.iterator];
}

let parser = new DOMParser();
let markup = '<p>Node 1</p><p>Node 2</p><p>Node 3</p><p>Node 4</p><p>Node 5</p>';
let doc = parser.parseFromString(markup, "text/html");
for (let element of doc.body.children) {
    document.body.appendChild(element);
}
Answer:1

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