diff --git a/wp-includes/html-api/class-wp-html-tag-processor.php b/wp-includes/html-api/class-wp-html-tag-processor.php
index 2ac8f469cf..9547aebd79 100644
--- a/wp-includes/html-api/class-wp-html-tag-processor.php
+++ b/wp-includes/html-api/class-wp-html-tag-processor.php
@@ -1465,9 +1465,9 @@ class WP_HTML_Tag_Processor {
 				$accumulated_shift_for_given_point += $shift;
 			}
 
-			$output_buffer        .= substr( $this->html, $bytes_already_copied, $diff->start - $bytes_already_copied );
-			$output_buffer        .= $diff->text;
-			$bytes_already_copied  = $diff->end;
+			$output_buffer       .= substr( $this->html, $bytes_already_copied, $diff->start - $bytes_already_copied );
+			$output_buffer       .= $diff->text;
+			$bytes_already_copied = $diff->end;
 		}
 
 		$this->html = $output_buffer . substr( $this->html, $bytes_already_copied );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3e50eb6f93..bc65594410 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55720';
+$wp_version = '6.3-alpha-55721';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.