I have upgraded HANA instance to Rev 60 from Rev 48. After the upgrade everything looks fine, only XS engine doesn't work. Throws 500 Dispatching error.
Some odd findings:
Some of the XS related roles are missing. They are not even available in F4 help list to be included in _SYS_REPO. Example sap.hana.xs.admin.roles::RuntimeConfAdministrator is missing.
Also, Schema _SYS_XS does not have the table RUNTIME_CONFIGURATION.
It seems some files were not loaded at the time of upgrade so I tried to manually import all Delivery Units and all the DUs are successfully imported and activated, except HANA_XS_BASE.
Also tried to load the DU manually from client but still no effect. Please see the detailed error log below: