Steps to reproduce:

1. Open attached project
2. In project tab, delete Test.aseet scriptable object
3. In top menu, click Test > Create Test Object
4. Click on created Test object and notice that two assets are found:
Test (DataObject)
Test (Test)
5. Close and reopen project and click on Test scriptable object again
6. Notice that console prints that 2 assets were found, however, one of them is null:
Test (Test)
(null)

Reproduced with: 5.2.4f1, 5.3.6p1, 5.4.0f3, 5.5.0a5