**Scenario**:
* Add some commits authored with an identity A that will get assigned to user X and some authored with an identity B that will not get assigned to anyone.
* Find the identity A in the list and explicitly unassign it from user X.
* Find the identity B in the list and explicitly assign it to user X.
* Go to user X's commit list from the user X's profile page or craft a query for Diffusion commits, specifying X as author.
**Expectations**:
Commits A are not returned, commits B are returned.
**Reality**:
Commits A are returned, commits B are not returned.