wp-includes/class-wp-taxonomy.php:555Removes the ajax callback for the meta box.
public function remove_hooks() { remove_filter( 'wp_ajax_add-' . $this->name, '_wp_ajax_add_hierarchical_term' ); }Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-taxonomy.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.