Content is lost when reloading the jupyter notebook

When I refresh the browser or close and reopen the jupyter notebook the workflow which was previously loaded from the Python workflow Definition is no longer visible. The boxes are displayed but the content is missing.

<img width="1015" height="504" alt="Image" src="https://github.com/user-attachments/assets/e06d693e-85fe-4c91-a4e4-72396797aadb" />