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Editing: class-amp-block-sanitizer.php

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<?php
/**
 * Class AMP_Block_Sanitizer.
 *
 * @package AMP
 */

/**
 * Class AMP_Block_Sanitizer
 *
 * Modifies elements created as blocks to match the blocks' AMP-specific configuration.
 *
 * @internal
 */
class AMP_Block_Sanitizer extends AMP_Base_Sanitizer {

/**
	 * Tag.
	 *
	 * @var string Figure tag to identify wrapper around AMP elements.
	 * @since 1.0
	 */
	public static $tag = 'figure';

/**
	 * Sanitize the AMP elements contained by <figure> element where necessary.
	 *
	 * @since 0.2
	 */
	public function sanitize() {
		$nodes     = $this->dom->getElementsByTagName( self::$tag );
		$num_nodes = $nodes->length;
		if ( 0 === $num_nodes ) {
			return;
		}

for ( $i = $num_nodes - 1; $i >= 0; $i-- ) {
			/**
			 * Element.
			 *
			 * @var DOMElement $node
			 */
			$node = $nodes->item( $i );

// We are only looking for <figure> elements which have wp-block-embed as class.
			$classes = preg_split( '/\s+/', trim( $node->getAttribute( 'class' ) ) );

if ( ! in_array( 'wp-block-embed', $classes, true ) ) {
				continue;
			}

$responsive_width  = null;
			$responsive_height = null;

// Remove classes related to aspect ratios as the embed's responsiveness will be handled by AMP's layout system.
			$classes = array_filter(
				$classes,
				static function ( $class ) use ( &$responsive_width, &$responsive_height ) {
					if ( preg_match( '/^wp-embed-aspect-(?P<width>\d+)-(?P<height>\d+)$/', $class, $matches ) ) {
						$responsive_width  = $matches['width'];
						$responsive_height = $matches['height'];
						return false;
					}
					return 'wp-has-aspect-ratio' !== $class;
				}
			);

$node->setAttribute( 'class', implode( ' ', $classes ) );

// We're looking for <figure> elements that have one child node only.
			if ( 1 !== count( $node->childNodes ) ) {
				continue;
			}

// @todo Should this only be done if the body has a .wp-embed-responsive class (i.e. current_theme_supports( 'responsive-embeds' ))?
			// @todo Should we consider just eliminating the .wp-block-embed__wrapper element since unnecessary?
			// For visual parity with blocks in non-AMP pages, override the oEmbed's natural responsive dimensions with the aspect ratio specified in the wp-embed-aspect-* class name.
			if ( $responsive_width && $responsive_height ) {
				$amp_element = $this->dom->xpath->query( './div[ contains( @class, "wp-block-embed__wrapper" ) ]/*[ @layout = "responsive" or @layout = "intrinsic"  ]', $node )->item( 0 );
				if ( $amp_element instanceof DOMElement ) {
					$amp_element->setAttribute( 'width', $responsive_width );
					$amp_element->setAttribute( 'height', $responsive_height );
					$amp_element->setAttribute( 'layout', 'responsive' );
				}
			}

$attributes = AMP_DOM_Utils::get_node_attributes_as_assoc_array( $node );

// We are looking for <figure> elements with layout attribute only.
			if (
				! isset( $attributes['data-amp-layout'] ) &&
				! isset( $attributes['data-amp-noloading'] ) &&
				! isset( $attributes['data-amp-lightbox'] )
			) {
				continue;
			}

$amp_el_found = false;

foreach ( $node->childNodes as $child_node ) {
				if ( ! $child_node instanceof DOMElement ) {
					continue;
				}

// We are looking for child elements which start with 'amp-'.
				if ( 0 !== strpos( $child_node->tagName, 'amp-' ) ) {
					continue;
				}
				$amp_el_found = true;

$this->set_attributes( $child_node, $node, $attributes );
			}

if ( false === $amp_el_found ) {
				continue;
			}
			$this->did_convert_elements = true;
		}
	}

/**
	 * Sets necessary attributes to both parent and AMP element node.
	 *
	 * @param DOMElement $node AMP element node.
	 * @param DOMElement $parent_node <figure> node.
	 * @param array      $attributes Current attributes of the AMP element.
	 */
	protected function set_attributes( DOMElement $node, DOMElement $parent_node, $attributes ) {
		if ( isset( $attributes['data-amp-layout'] ) ) {
			$node->setAttribute( 'layout', $attributes['data-amp-layout'] );
		}
		if ( isset( $attributes['data-amp-noloading'] ) && true === filter_var( $attributes['data-amp-noloading'], FILTER_VALIDATE_BOOLEAN ) ) {
			$node->setAttribute( 'noloading', '' );
		}

$layout = $node->getAttribute( 'layout' );

// The width has to be unset / auto in case of fixed-height.
		if ( 'fixed-height' === $layout ) {
			if ( ! isset( $attributes['height'] ) ) {
				$node->setAttribute( 'height', self::FALLBACK_HEIGHT );
			}
			$node->setAttribute( 'width', 'auto' );

$height = $node->getAttribute( 'height' );
			if ( is_numeric( $height ) ) {
				$height .= 'px';
			}
			$parent_node->setAttribute( 'style', "height: $height; width: auto;" );

// The parent element should have width/height set and position set in case of 'fill'.
		} elseif ( 'fill' === $layout ) {
			if ( ! isset( $attributes['height'] ) ) {
				$attributes['height'] = self::FALLBACK_HEIGHT;
			}
			$parent_node->setAttribute( 'style', 'position:relative; width: 100%; height: ' . $attributes['height'] . 'px;' );
			$node->removeAttribute( 'width' );
			$node->removeAttribute( 'height' );
		} elseif ( 'responsive' === $layout ) {
			$parent_node->setAttribute( 'style', 'position:relative; width: 100%; height: auto' );
		} elseif ( 'fixed' === $layout ) {
			if ( ! isset( $attributes['height'] ) ) {
				$node->setAttribute( 'height', self::FALLBACK_HEIGHT );
			}
		}

// Set the fallback layout in case needed.
		$attributes = AMP_DOM_Utils::get_node_attributes_as_assoc_array( $node );
		$attributes = $this->set_layout( $attributes );
		if ( $layout !== $attributes['layout'] ) {
			$node->setAttribute( 'layout', $attributes['layout'] );
		}
	}
}

Editing: class-amp-block-sanitizer.php

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