diff --git a/wp-includes/class-wp-theme-json.php b/wp-includes/class-wp-theme-json.php
index 3dba653520..7cc87759ab 100644
--- a/wp-includes/class-wp-theme-json.php
+++ b/wp-includes/class-wp-theme-json.php
@@ -1199,7 +1199,7 @@ class WP_Theme_JSON {
 				$node['selector'] = static::scope_selector( $options['scope'], $node['selector'] );
 			}
 			foreach ( $style_nodes as &$node ) {
-				$node['selector'] = static::scope_selector( $options['scope'], $node['selector'] );
+				$node = static::scope_style_node_selectors( $options['scope'], $node );
 			}
 			unset( $node );
 		}
@@ -1825,6 +1825,39 @@ class WP_Theme_JSON {
 		return $result;
 	}
 
+	/**
+	 * Scopes the selectors for a given style node.
+	 *
+	 * This includes the primary selector, i.e. `$node['selector']`, as well as any custom
+	 * selectors for features and subfeatures, e.g. `$node['selectors']['border']` etc.
+	 *
+	 * @since 6.6.0
+	 *
+	 * @param string $scope Selector to scope to.
+	 * @param array  $node  Style node with selectors to scope.
+	 * @return array Node with updated selectors.
+	 */
+	protected static function scope_style_node_selectors( $scope, $node ) {
+		$node['selector'] = static::scope_selector( $scope, $node['selector'] );
+
+		if ( empty( $node['selectors'] ) ) {
+			return $node;
+		}
+
+		foreach ( $node['selectors'] as $feature => $selector ) {
+			if ( is_string( $selector ) ) {
+				$node['selectors'][ $feature ] = static::scope_selector( $scope, $selector );
+			}
+			if ( is_array( $selector ) ) {
+				foreach ( $selector as $subfeature => $subfeature_selector ) {
+					$node['selectors'][ $feature ][ $subfeature ] = static::scope_selector( $scope, $subfeature_selector );
+				}
+			}
+		}
+
+		return $node;
+	}
+
 	/**
 	 * Gets preset values keyed by slugs based on settings and metadata.
 	 *
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 79a32170cc..8373aff672 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-58243';
+$wp_version = '6.6-alpha-58244';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.