Bug report

It should be possible to do this:

        $xml = new \SimpleXmlElement('');
		$xml->test[] = 'bla';

But an error is thrown:
Cannot access an offset on bool|float|int|SimpleXMLElement|string|null.

Code snippet that reproduces the problem

https://phpstan.org/r/aca8e681-6ba1-4ab9-a800-8c5ebfba5fbe

Expected output

No errors

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