I opened the file you sent, but there is nothing in the diagram. In the Model Explorer, the dependencies appear to be broken, showing "?", and it is also strange that the model elements are placed under the Diagram. Overall, it seems that the model is corrupted.
Hmm, maybe it was because I had demo files generated by an LLM. I’ve now created them again in a completely self-built model, and now the relationships are working as well. Sorry for the confusion! I’ll keep monitoring it.