WORKAROUND:
Instead of using "Description" a custom field could be used which can be filtered on
To setup a custom field:
1. Logon in to /admin | System Status / Settings | Global Settings | Custom Column Names
2. Enter a custom column name in one of "ManagedAccount.AccountCustomx" or "ManagedSystem.SystemCustom1" fields, for example "Custom Description".
3. Once this has been saved, the custom column will appear on /tpam under the Managed Account or Managed System where you can enter this information and filter on.
STATUS
The ability to search on the system or account description was added in 2.5.920.