diff --git a/wp-includes/html-api/class-wp-html-decoder.php b/wp-includes/html-api/class-wp-html-decoder.php
index d902f4b7ca..d14009d3d9 100644
--- a/wp-includes/html-api/class-wp-html-decoder.php
+++ b/wp-includes/html-api/class-wp-html-decoder.php
@@ -424,7 +424,7 @@ class WP_HTML_Decoder {
 	 * @return string Converted code point, or `�` if invalid.
 	 */
 	public static function code_point_to_utf8_bytes( $code_point ): string {
-		$string = mb_chr( $code_point );
+		$string = mb_chr( $code_point, 'UTF-8' );
 
 		return false !== $string ? $string : '�';
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d3cf146b41..7c7ad9d166 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.1-alpha-62486';
+$wp_version = '7.1-alpha-62487';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.