Action: Make a Ticket, add a Fieldset, e.g. checkboxes, etc. Save the Ticket & update the Event. Unexpected behavior: Go and try to edit the Fieldset. Upon saving the Ticket, the changes do not hold. Work around: Delete Fieldset, save, go back in and make a new with a different name.
Once the ticket fieldset is applied to an actual ticket for an event further changes made to it (adding or removing fields) won’t be updated in all ticket instances. Tickets fieldsets are like templates that apply to a ticket but are not linked to them so further updates on the actual fieldset won’t impact existing tickets.