After the upgrade to New York, HR service and Topic detail are not set for most of the HR cases. Basically these details are set from the script in record producer and the template used on the HR service.
New York Patch 4 Hot Fix 1
The issue is because of the script include 'hr_Utils' is customized.
When the Script Include 'hr_Utils' is reverted to OOB, new HR cases that are submitted having the correct data for HR service and Topic detail.