diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
--- a/wp/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php	Fri Sep 05 18:40:08 2025 +0200
@@ -261,8 +261,10 @@
 	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
 	 */
 	protected function do_permissions_check() {
-		// Verify if the current user has edit_theme_options capability.
-		// This capability is required to access the widgets screen.
+		/*
+		 * Verify if the current user has edit_theme_options capability.
+		 * This capability is required to access the widgets screen.
+		 */
 		if ( ! current_user_can( 'edit_theme_options' ) ) {
 			return new WP_Error(
 				'rest_cannot_manage_widgets',
@@ -318,8 +320,9 @@
 
 		// Restores the more descriptive, specific name for use within this method.
 		$raw_sidebar = $item;
-		$id          = $raw_sidebar['id'];
-		$sidebar     = array( 'id' => $id );
+
+		$id      = $raw_sidebar['id'];
+		$sidebar = array( 'id' => $id );
 
 		if ( isset( $wp_registered_sidebars[ $id ] ) ) {
 			$registered_sidebar = $wp_registered_sidebars[ $id ];
@@ -339,6 +342,10 @@
 			$sidebar['class']       = '';
 		}
 
+		if ( wp_is_block_theme() ) {
+			$sidebar['status'] = 'inactive';
+		}
+
 		$fields = $this->get_fields_for_response( $request );
 		if ( rest_is_field_included( 'widgets', $fields ) ) {
 			$sidebars = wp_get_sidebars_widgets();
@@ -368,7 +375,9 @@
 
 		$response = rest_ensure_response( $data );
 
-		$response->add_links( $this->prepare_links( $sidebar ) );
+		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
+			$response->add_links( $this->prepare_links( $sidebar ) );
+		}
 
 		/**
 		 * Filters the REST API response for a sidebar.