The cookie looks like it is being set by the PHP session handling process. WordPress ‘out of the box’ doesn’t use sessions, which would seem to point towards either your theme or a plugin.
If you search your code base for ‘session_start’ you may be able to track down where the session is being initiated.
PHP can also be set to auto start sessions. You may also need to check your php.ini file(s) for the ‘session.auto_start’ property.
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