diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index 93008dd567..5fa7a23146 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -1024,6 +1024,8 @@ function get_theme_mod( $name, $default = false ) {
 	if ( is_string( $default ) ) {
 		// Only run the replacement if an sprintf() string format pattern was found.
 		if ( preg_match( '#(?<!%)%(?:\d+\$?)?s#', $default ) ) {
+			// Remove a single trailing percent sign.
+			$default = preg_replace( '#(?<!%)%$#', '', $default );
 			$default = sprintf( $default, get_template_directory_uri(), get_stylesheet_directory_uri() );
 		}
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 1d00974a4b..e69a2c8535 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-49067';
+$wp_version = '5.6-alpha-49068';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.