Updating response in collection by updating spec in define section

Updating the collection when spec is updated on define section. I am trying to write spec for the api on the Define section of postman. I generated the collection, mock server and environment and those are working as expected. Whenever I update the summary or description of the spec, those are reflected on the collection once do the validation from the Develop section. However if I update the response of the spec, it is NOT reflected on the collection even if I do the validation. Only way to see changes is to create the new collection and mock server which seems like very cumbersome way to update the collection.

I am confused why only some changes are reflected on the collection. Is there a better way to update the collection when spec is update other than generating the new collection or updating via the postman api ?