diff --git a/wp-includes/class-wp-theme-json-resolver.php b/wp-includes/class-wp-theme-json-resolver.php
index 5a785612ce..44db8364f1 100644
--- a/wp-includes/class-wp-theme-json-resolver.php
+++ b/wp-includes/class-wp-theme-json-resolver.php
@@ -312,9 +312,6 @@ class WP_Theme_JSON_Resolver {
 			}
 			$theme_support_data['settings']['color']['defaultGradients'] = $default_gradients;
 
-			// Classic themes without a theme.json don't support global duotone.
-			$theme_support_data['settings']['color']['defaultDuotone'] = false;
-
 			// Allow themes to enable link color setting via theme_support.
 			if ( current_theme_supports( 'link-color' ) ) {
 				$theme_support_data['settings']['color']['link'] = true;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index abfa6ea23a..5ecbb167c7 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57259';
+$wp_version = '6.5-alpha-57260';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.