Rendering an amp document in a shell page

I am trying to render an amp doc similar to https://codelabs.developers.google.com/codelabs/amp-in-pwa/#6

When I do

fetchDocument(url).then(function(doc) {
        // Let AMP take over and render the page
        var ampedDoc = AMP.attachShadowDoc(container, doc, url);
        ampedDoc.close();

    });

the amp doc (fetched from url) is placed in the container but amp-tags are not rendered.

For example: amp-img tag is in the sources but it does not render as an img tag in the way "Googe Search" does when it renders that doc.

Question: Is there a way to render amp-components when loading amp documents with https://cdn.ampproject.org/shadow-v0.js