What would happen if a Ticket Template with a set of Activities with Job Plans...

The activities become follow-up Work Orders with a Job Plan applied, they are visible from the Related Records tab of the Service Request.

The activities are ignored when applying to a Service Request as Activities are only used with Incidents and Problems.

Each activity will create a Work Order record of class ACTIVITY, no tasks would be created because records of class ACTIVITY cannot have tasks.

Each activity will create a Work Order record of class ACTIVITY with the Job Plans applied, there may be tasks if the Job Plan had tasks.