Reported in https://forum.matomo.org/t/visitor-profile-bug/34827 and can be reproduced in demo
When I press ‘Load more visits’ button, the only thing that loads is headers of visits and info about it, but not actions. When I press then say ‘64 actions in 39 min 42s’ in loaded visits after previous press - nothing happens. Maybe this is intended? Then how I can view older actions of visitor?
Problem can be reproduced on your demo site:
This problem also exists in 3.11 version