I'm sorry, but the knowledge sources provided do not contain any information about integrating Elementary with the new dbt Fusion engine or any known issues specifically related to the on-run-end procedure in that context. The available documentation and community discussions focus on performance, errors, and configuration of the on-run-end hook with standard dbt versions, but do not mention dbt Fusion or its compatibility with Elementary. If you are experiencing issues with dbt Fusion, I recommend reaching out directly to the Elementary or dbt support channels for the most up-to-date information. If you have logs or specific error messages, sharing those with the support team may help diagnose the problem more effectively.