Hi JB,
sounds like a general issue with the _SYS_RT schema.
SHINE wise there have been adaptions to the table names and hence on the models based on these tables.
If you have not done any changes to the tables/models the upgrade from SP7 SHINE to SP8 SHINE should work fine. If not, please undeploy the older delivery unit of SHINE and then install the new one.
You can check the SHINE release note here:
1934114 - SAP HANA DEMO MODEL - SHINE Release & Information Note
best regards,
Simon