The summit__Event_Instance_Date_Time_Formatted__c field is not being populated for Hosted Guest Summit Events Registration records.

[walt0019]

Describe the bug
The summit__Event_Instance_Date_Time_Formatted__c field is not being populated for Hosted Guest Summit Events Registration records. The field is populated via code upon the creation of the Summit Events Registration registration for non-guest registrations. At St. Thomas, we have largely transitioned to all formula fields for details sent via communication in case a record is reparented to a new Instance.

To Reproduce
Steps to reproduce the behavior:
Register for an event that allows guest.
Register for the event and add a guest.
Review Registration records and the guest registration will not have the Event Instance Date Time Formatted field populate.

Expected behavior
The field will be populated for all registrations coming through the Summit Event registration pages.

Screenshots

Additional context
Created formula field to avoid using code driven code. Field formula is summit__Event_Instance_Start_Date_Text__c + ", "+TEXT(YEAR(summit__Event_Instance_Start_Date__c))+", "+summit__Event_Instance_Start_Time_Text__c+" - "+summit__Event_Instance_End_Time_Text__c + " "+LEFT(summit__Event_Instance_Time_Zone__c, FIND(" ", summit__Event_Instance_Time_Zone__c) - 1)

We named the field Event Instance Details Formula.