When a lead event spans multiple domains, the LeadiD token must persist through each domain. The Jornaya campaign script is designed to utilize a first party cookie.
When a new page loads, the script will first check the hidden input field and the cookie before creating a new LeadiD token. In the event that a new domain is loaded or any part of the domain changes, the first party cookie will no longer be available and thus, the token must be passed into the hidden input field BEFORE the Jornaya campaign script fires so that token is picked up to continue the lead event.
If this does not happen a new LeadiD token will be created which will lead to disruptions in data.