Exempt requests that include a post arg

src/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php

@@ -299,8 +299,16 @@ public function get_items( $request ) {
 		/*
 		 * When a taxonomy is registered with an 'args' array,
 		 * those params override the `$args` passed to this function.
+		 *
+		 * We only need to do this if no `post` argument is provided.
+		 * Otherwise, terms will be fetched using `wp_get_object_terms()`,
+		 * which respects the default query arguments set for the taxonomy.
 		 */
-		if ( isset( $taxonomy_obj->args ) && is_array( $taxonomy_obj->args ) ) {
+		if (
+			empty( $prepared_args['post'] ) &&
+			isset( $taxonomy_obj->args ) &&
+			is_array( $taxonomy_obj->args )
+		) {
 			$prepared_args = array_merge( $prepared_args, $taxonomy_obj->args );
 		}