Renders the `core/post-featured-image` block on the server.

function render_block_core_post_featured_image( $attributes, $content, $block ) {
	if ( ! isset( $block->context['postId'] ) ) {
		return '';
	}
	$post_ID = $block->context['postId'];

	$is_link        = isset( $attributes['isLink'] ) && $attributes['isLink'];
	$size_slug      = isset( $attributes['sizeSlug'] ) ? $attributes['sizeSlug'] : 'post-thumbnail';
	$post_title     = trim( strip_tags( get_the_title( $post_ID ) ) );
	$attr           = get_block_core_post_featured_image_border_attributes( $attributes );
	$overlay_markup = get_block_core_post_featured_image_overlay_element_markup( $attributes );

	if ( $is_link ) {
		$attr['alt'] = $post_title;
	}

	$featured_image = get_the_post_thumbnail( $post_ID, $size_slug, $attr );
	if ( ! $featured_image ) {
		return '';
	}
	$wrapper_attributes = get_block_wrapper_attributes();
	if ( $is_link ) {
		$link_target    = $attributes['linkTarget'];
		$rel            = ! empty( $attributes['rel'] ) ? 'rel="' . esc_attr( $attributes['rel'] ) . '"' : '';
		$featured_image = sprintf(
			'%4$s%5$s',
			get_the_permalink( $post_ID ),
			esc_attr( $link_target ),
			$rel,
			$featured_image,
			$overlay_markup
		);
	} else {
		$featured_image = $featured_image . $overlay_markup;
	}

	$has_width  = ! empty( $attributes['width'] );
	$has_height = ! empty( $attributes['height'] );
	if ( ! $has_height && ! $has_width ) {
		return "
{$featured_image}
";
	}

	if ( $has_width ) {
		$wrapper_attributes = get_block_wrapper_attributes( array( 'style' => "width:{$attributes['width']};" ) );
	}

	if ( $has_height ) {
		$image_styles = "height:{$attributes['height']};";
		if ( ! empty( $attributes['scale'] ) ) {
			$image_styles .= "object-fit:{$attributes['scale']};";
		}
		$featured_image = str_replace( '{$featured_image}";
}