diff -r be944660c56a -r 3d72ae0968f4 wp/wp-includes/blocks/rss.php
--- a/wp/wp-includes/blocks/rss.php	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-includes/blocks/rss.php	Tue Sep 27 16:37:53 2022 +0200
@@ -13,6 +13,10 @@
  * @return string Returns the block content with received rss items.
  */
 function render_block_core_rss( $attributes ) {
+	if ( in_array( untrailingslashit( $attributes['feedURL'] ), array( site_url(), home_url() ), true ) ) {
+		return '<div class="components-placeholder"><div class="notice notice-error">' . __( 'Adding an RSS feed to this site’s homepage is not supported, as it could lead to a loop that slows down your site. Try using another block, like the <strong>Latest Posts</strong> block, to list posts from the site.' ) . '</div></div>';
+	}
+
 	$rss = fetch_feed( $attributes['feedURL'] );
 
 	if ( is_wp_error( $rss ) ) {
@@ -83,10 +87,19 @@
 	if ( isset( $attributes['blockLayout'] ) && 'grid' === $attributes['blockLayout'] ) {
 		$classnames[] = 'is-grid';
 	}
-
 	if ( isset( $attributes['columns'] ) && 'grid' === $attributes['blockLayout'] ) {
 		$classnames[] = 'columns-' . $attributes['columns'];
 	}
+	if ( $attributes['displayDate'] ) {
+		$classnames[] = 'has-dates';
+	}
+	if ( $attributes['displayAuthor'] ) {
+		$classnames[] = 'has-authors';
+	}
+	if ( $attributes['displayExcerpt'] ) {
+		$classnames[] = 'has-excerpts';
+	}
+
 	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classnames ) ) );
 
 	return sprintf( '<ul %s>%s</ul>', $wrapper_attributes, $list_items );