Current State:

When you change a request type from one without forms to one with forms, the Jira field linked to the form does not appear in the portal view. This is because JSM avoids displaying duplicate fields.

Setup:

• one request type has forms (A) and one does not (B).
• Request type with forms (A), has the Description field in the form, linked to the jira Description field, so it is not also visible in the request type.
• Now, create a ticket with the request type (B) that does not have forms included in it and then change the ticket to request type A
• The description disappears from the portal view.

In short, when the ticket is changed from a request type that does not have forms to a request type that includes forms, fields that were previously visible are now not shown. The form is also not added or user is not warned about this change at all and it is not required to add a form. But customer is confused because a field that was visible earlier is not visible anymore. 
Please note - This is because of the fact that JSM avoids displaying duplicate fields

Proposed Future State:

When there is a change of request type from one with no forms to one with forms, any fields linked to form fields and hence not shown in portal should be visible so as to not cause confusion

Alternative (e.g. Third Party Plugin):

None