PHP 8.1 and WordPress 6.1.1

We are currently running a test for compatibility of wordpress 6.1.1 and PHP 8.1. However, our install gives this error below.

Fatal error: Uncaught Error: Undefined constant "‘FS_METHOD’" in /var/www/liblog/wp-config.php:77 Stack trace: #0 /var/www/liblog/wp-load.php(50): require_once() #1 /var/www/liblog/wp-blog-header.php(13): require_once('/var/www/liblog...') #2 /var/www/liblog/index.php(17): require('/var/www/liblog...') #3 {main} thrown in /var/www/liblog/wp-config.php on line 77

Here are the last lines of the config file:

define ('WPLANG', '');
/* That's all, stop editing! Happy blogging. / /* WordPress absolute path to the WordPress directory. / if ( !defined('ABSPATH') ) define('ABSPATH', dirname(FILE) . '/'); /* Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');
//define(ENABLE_CACHE, true)
define('FS_METHOD','DIRECT');
?>

It would seem that define('FS_METHOD','DIRECT'); is not in the correct place. If I move it up above define ('WPLANG', '', everything works.

But how did it get to that last line?
Is it safe to move it up?
More importantly, will it come back every time I do an update?