Bug report

With the upgrade from 0.12.98 => 0.12.99 the SimpleXMLElement children returns self instead of static

Code snippet that reproduces the problem

https://phpstan.org/r/8b1dcfe2-b5bb-419e-9cf3-38b13748cc85

Expected output

The return type of SimpleXMLElement->children() should be the static class. In this case MySimpleXML

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