As part of the hierarchical changes to the core that were implemented in v8.0, it is now possible for an instance of the core to include logic that can be shared between multiple cores, this shared logic was previously exposed in the example design for the core.
If you are updating a version of the core previous to v8.0 to a new one with Shared Logic there might not be a simple upgrade path and it is recommended to see Shared Logic for guidance.