diff --git a/wp-includes/block-template.php b/wp-includes/block-template.php
index c2cf0d1086..d745c0536a 100644
--- a/wp-includes/block-template.php
+++ b/wp-includes/block-template.php
@@ -170,11 +170,7 @@ function get_the_block_template_html() {
 	$content = $wp_embed->autoembed( $content );
 	$content = do_blocks( $content );
 	$content = wptexturize( $content );
-	if ( function_exists( 'wp_filter_content_tags' ) ) {
-		$content = wp_filter_content_tags( $content );
-	} else {
-		$content = wp_make_content_images_responsive( $content );
-	}
+	$content = wp_filter_content_tags( $content );
 	$content = str_replace( ']]>', ']]>', $content );
 
 	// Wrap block template in .wp-site-blocks to allow for specific descendant styles
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a82863950c..3e00daf983 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51309';
+$wp_version = '5.9-alpha-51321';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.