After upgrading from 3.7.17 to 20.2.9, nhDescription in Data Collection nhLiveAlarm traps are the 21st Oid in the list, not the 23rd, this does not match the order in the MIB definition file.
Release : 20.2, 21.2
Component : IM Reporting / Admin / Configuration
The fix for this issue is currently targeted for CA Performance Management DX Netops Performance Management 21.2.4
Note that this is subject to change and there are no release dates that can be provided at this time.