DOMParser.parseFromString TypeError: undefined is not an object (evaluating 'new window.HTMLDocument')

Describe the bug
Using bun, I get the following error when trying to use DOMParser.parseFromString:

84 |      */
85 |     #createDocument(mimeType) {
86 |         const window = this[PropertySymbol.window];
87 |         switch (mimeType) {
88 |             case 'text/html':
89 |                 return new window.HTMLDocument();
                                ^
TypeError: undefined is not an object (evaluating 'new window.HTMLDocument')
      at #createDocument (/node_modules/happy-dom/lib/dom-parser/DOMParser.js:89:28)
      at parseFromString (/node_modules/happy-dom/lib/dom-parser/DOMParser.js:22:34)

Bun v1.1.30 (macOS arm64)

To Reproduce
Steps to reproduce the behavior:
Run a script with bun that does something like:

import { DOMParser } from "happy-dom";

const parser = new DOMParser();
	const page = parser.parseFromString(
		`
<!DOCTYPE html>
<html>
  <body>
	<div>hi</div>
  </body>
</html>
`,
		"text/html",
	);

Expected behavior
A successfully parsed document

Screenshots

Device:

OS: macOS
Browser n/a
Version latest

Additional context
Add any other context about the problem here.

I found another bug related to this feature (lmk if I should report as a different issue) - it seems like this string <body><x></x>Example Text will not detect body as the root, although it should - this will break HappyDOM for use in frameworks like Angular.
(new window.DOMParser()).parseFromString("<body><x></x>Example Text", "text/html").body.innerHTML
Chrome: <x></x>Example Text
HappyDOM: <body><x></x>Example Text</body>.
Looks like the cause is in:

happy-dom/packages/happy-dom/src/dom-parser/DOMParser.ts

Line 44 in afd256b

if (node['tagName'] === 'HTML') {

tagName BODY should match as well in order to correctly detect documentTypeNode.
It somewhat seems like it's the intent of the next check to catch this case, but I am not sure why that is not working or if the intent is different.
node[PropertySymbol.nodeType] === NodeTypeEnum.documentTypeNode
@capricorn86