The Update Rollup 1 for System Center Service Manager 2019 was released and contains mostly fixes for Self-Service Portal, but there is one change that may cause big impact on highly-customized environments: SCSM now supports spaces in the Work Items prefixes, so you may have now incident id like “IR 1234”. This may affect some custom development where you count on format of the id.

Link to the update: https://support.microsoft.com/en-us/help/4532891/update-rollup-1-for-system-center-service-manager-2019