Hi Nicolas,
I have just created and submitted two orders (on the live server with real money); one on PayPal as a guest, status backend confirmed, came back to website, cart cleared. WorldPay, guest with a different unique/guest email address, backend status confirmed, cart not cleared.
So definitely and issue with the WorldPay plugin under PHP8.2 I can no longer set PHP back to 7.4 as I have upgraded Some Regular Labs components and plugins which will break Joomla 4 under PHP 7.4
i couldn't use my test environment on the other server as this needs to be rebuilt as I removed all plugins that were not core
All the best
Ian