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Editing: cover.php

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<?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 string $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 whitespace 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();
		if ( ! $current_featured_image ) {
			return $content;
		}

$processor = new WP_HTML_Tag_Processor( $content );
		$processor->next_tag();

$styles         = $processor->get_attribute( 'style' );
		$merged_styles  = ! empty( $styles ) ? $styles . ';' : '';
		$merged_styles .= 'background-image:url(' . esc_url( $current_featured_image ) . ');';

$processor->set_attribute( 'style', $merged_styles );
		$content = $processor->get_updated_html();
	}

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' );

Editing: cover.php

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