get_start_coordinates() None when creating the bongard problem from action string list

[prateekgulati]

When creating Bongard Problem by using import_from_action_string_list, why do get_start_coordinates() return list of None?
Even positive_bongard_image.get_start_coordinates() for positive_bongard_image in bongard_problem_recovered.positive_bongard_images return list of None

I am using Demo and then bongard_problem_recovered.get_start_coordinates()