I’m not sure if this is by design or not.
Reproduce:Use Scrum template 2.2Notice Status property is transition-onlyLog in as a project team member (non admin)Select Story and Add with detail
Result:You can set the status for a new Story. However, the property is read-only when editing an existing Story.
Expected:Transition-only properties cannot be set when creating (just like Editing).
From the Mingle 2.2 help on transition only properties:Project and Mingle admins can update transition only properties from the card view. Only team members are restricted to updating by transitions on all views.