Fix: Update variable name from $q to $args in WP_Query class for consistency in orderby parameter handling.

Author: ramonjd

src/wp-includes/class-wp-query.php

@@ -5043,7 +5043,7 @@ protected function generate_cache_key( array $args, $sql ) {
 		}
 
 		// Add a default orderby value of date to ensure same cache key generation.
-		if ( ! isset( $q['orderby'] ) ) {
+		if ( ! isset( $args['orderby'] ) ) {
 			$args['orderby'] = 'date';
 		}