Hi, I can't get you access to the website I'm working on, but I exported the work and placed it on one of your installations (MEDNIC), and I can confirm that the sorting isn't working.
In Mednic, even if I set the sorting to date, and try to shuffle the input data, it doesn't take that data into account.
In the hidden content, I've included the login details and the link to view the simulation. This happens with both Joomla 5.4.2 and Joomla 6.0.2.
In Joomla 5, it places the date last, but in mednic (Joomla 6), it doesn't even consider the order.