When the session is shared between admin SiteAccess and others which use Page Builder, there is an additional session cookie set.

Steps to reproduce:
1. Apply the following configuration with shared session name:

some_siteaccess:
    session:
        name: coyote
        cookie_domain: 'coyote.ezp'
        cookie_path: /
admin:
    session:
        name: coyote
        cookie_domain: 'coyote.ezp'
        cookie_path: /

2. Log in to admin panel.

Result:
There is an additional cookie set, please see the attached screenshot.