Hi lyonye
Are you using latest version of Hikashop? the old version will not work in Joomla 4.
For K2, it's not ready for Joomla 4 yet.
When using Cassiopeia template, there is no other modules/plugins used there so you don't see error, when you use JA Jason, try to enable debug system option in global configuration, it will show the error in details and see which one caused issue.