diff -r be944660c56a -r 3d72ae0968f4 wp/wp-includes/blocks/cover.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/blocks/cover.php	Tue Sep 27 16:37:53 2022 +0200
@@ -0,0 +1,71 @@
+<?php
+/**
+ * Server-side rendering of the `core/cover` block.
+ *
+ * @package WordPress
+ */
+
+/**
+ * Renders the `core/cover` block on server.
+ *
+ * @param array $attributes The block attributes.
+ * @param array $content    The block rendered content.
+ *
+ * @return string Returns the cover block markup, if useFeaturedImage is true.
+ */
+function render_block_core_cover( $attributes, $content ) {
+	if ( 'image' !== $attributes['backgroundType'] || false === $attributes['useFeaturedImage'] ) {
+		return $content;
+	}
+
+	if ( ! ( $attributes['hasParallax'] || $attributes['isRepeated'] ) ) {
+		$attr = array(
+			'class'           => 'wp-block-cover__image-background',
+			'data-object-fit' => 'cover',
+		);
+
+		if ( isset( $attributes['focalPoint'] ) ) {
+			$object_position              = round( $attributes['focalPoint']['x'] * 100 ) . '%' . ' ' . round( $attributes['focalPoint']['y'] * 100 ) . '%';
+			$attr['data-object-position'] = $object_position;
+			$attr['style']                = 'object-position: ' . $object_position;
+		}
+
+		$image = get_the_post_thumbnail( null, 'post-thumbnail', $attr );
+
+		/*
+		 * Inserts the featured image between the (1st) cover 'background' `span` and 'inner_container' `div`,
+		 * and removes eventual withespace characters between the two (typically introduced at template level)
+		 */
+		$inner_container_start = '/<div\b[^>]+wp-block-cover__inner-container[\s|"][^>]*>/U';
+		if ( 1 === preg_match( $inner_container_start, $content, $matches, PREG_OFFSET_CAPTURE ) ) {
+			$offset  = $matches[0][1];
+			$content = substr( $content, 0, $offset ) . $image . substr( $content, $offset );
+		}
+	} else {
+		if ( in_the_loop() ) {
+			update_post_thumbnail_cache();
+		}
+		$current_featured_image = get_the_post_thumbnail_url();
+		$content                = preg_replace(
+			'/class=\".*?\"/',
+			'${0} style="background-image:url(' . esc_url( $current_featured_image ) . ')"',
+			$content,
+			1
+		);
+	}
+
+	return $content;
+}
+
+/**
+ * Registers the `core/cover` block renderer on server.
+ */
+function register_block_core_cover() {
+	register_block_type_from_metadata(
+		__DIR__ . '/cover',
+		array(
+			'render_callback' => 'render_block_core_cover',
+		)
+	);
+}
+add_action( 'init', 'register_block_core_cover' );