When i use the PUT method in any model, the method ask to fill the required fields and updated to null value the unspecified fields, (similar behavior to a POST method). Can´t update a single field!
Description/Steps to reproduce
Get method:

PUT:

Response.

Another case is the deletion of unspecified fields
GET:

PUT:

PUT response:

GET method again:

Expected result
The expected result is a response with the updated field without modify the unspecified fields.