[BUG]: Workflow Not Loading Correctly in Self-Hosted Mode

[Bangkah]

Description

When running Sim in a self-hosted environment (local or Docker), some previously created workflows fail to load correctly in the editor after a page refresh or server restart. The workflow appears in the list, but the canvas is either empty or missing several nodes.

This makes the workflow impossible to edit or run.

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Steps to Reproduce

1. Run Sim in self-hosted mode:
   • Using npx simstudio, or
   • Using Docker (docker-compose up)
2. Open the web UI in the browser.
3. Create a new workflow with multiple nodes and connections.
4. Save the workflow.
5. Refresh the browser or restart the Sim server.
6. Open the saved workflow from the workflow list.

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Expected Behavior

The workflow should load completely and appear exactly as it was saved, with all nodes and connections intact.

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Actual Behavior

The workflow canvas loads partially or appears completely empty, even though the workflow exists in the list.

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Environment

• Sim version: latest
• Deployment: Self-hosted (local / Docker)
• OS: Windows / macOS / Linux
• Browser: Chrome / Firefox
• Node.js version: (if applicable)

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Additional Context

This issue seems to occur more frequently with larger or more complex workflows and often after restarting the server or refreshing the page.