A new Service Point functionality, Service Point - Ability to Filter "My Tickets", was introduced in 17.3 RU19.
If a prefix is set as a part of ticket sequence number (e.g. "HD-") and search for the Ticket ID without the prefix in 'My Tickets' search, no ticket will be searched.
STEPS TO REPRODUCE:
CA Service Desk Manager 17.3 RU19
Solution is provided in the latest RU23 patch