extract wrote: But, the cookie YII_CSRF_TOKEN is not reload in this case. Is it noramal?
I consider that normal.
The CSRF cookie is not just placed when you e.g. just enter ta survey. You will only see a PHPSESSID cookie (name depends on serversite setting), which will contain survey data. Which will be deleted when newtest=Y is used.
The purpose of the CSRF-Token is set, when you e.g. get a login screen for the backend. If you're logged in as a user, you wouldn't want to recreate the CSRF-Token when you just want to delete a survey response session.
The CSRF is not set when you enter the index page of LimeSurvey. But everywhere else to ensure every interaction between the browser and LimeSurvey is from just your browser.
The login screen is the easiest example to unterstand the difference between these two cookies.