CartThrob Subscriptions: exp:cartthrob:change_plan_form - does not create Order entry or return to success page

[creativearc-paul]

A change_plan_form with the params:

{exp:cartthrob:change_plan_form
                    charge_difference="yes"
                    refund_difference="yes"
                     subscription_id="{id}"
                    return="/account"
                fail_return="subscriptions/change_plan/{segment_3}"
                }

• Seems to properly change the subscription to the NEW plan
• Seems to disable old plan, but
• Does not create order
• Does not have proper return=url - displays code/summary instead of

Brief video: https://www.dropbox.com/scl/fi/cigl1v0vrij6kiwipjee3/2025-07-23_16-59-39.mp4?rlkey=rl46ldsdf5j423mv3vmt37mvl&dl=0