What Happens with Nested Fake Headings

This is a custom element with role="heading" and aria-level="2". It contains a <div> with role="group". That <div> contains another custom element with role="heading" but with aria-level="3".

The following code shows that same construct in HTML. An <h3> nested in a <section> nested in a <h2>.

A Real Level 3 Heading

Neither of these constructs is valid. Test with your favorite automated testing tools to see which gets flagged.