Since upgrading to 7.x , the GUID of an object is not returned the Get request is used (i.e. scripts, Identity Manager integration...) returning the error:
"The directory object not found in cache"
The get request does not return common attributes such as sid, ObjectGUID and etc.
Built-in policies are overriding get request giving "The directory object not found in cache" error message in the MMC, Management Shell, and the Web Interface.
This issue has been verified as a defect and logged as defect ID TF00748864 and is expected to be addressed in the next 7.2 Maintenance Release that is planned for March 2018.