New response code for "Create new assignment"

For creating new assignments I previously received a response code of 200 “Success”.
In the latest version 21.05 I now get a new response code of 201 “Created assignment with details”.
My question is: what is meant by “details”? Does it refer to preloading of variables?

HTTP status codes from 2XX group indicate success.

Code 201 is more appropriate for the successful assignment creation then generic 200, because the action results in creation of a new object.

Okay, but 200 is still documented as the standard success code in the Swagger UI.
So I take it it is obsolete now.