Workflows empty when switching to another workflow

### Custom Node Testing

- [ ] I have tried disabling custom nodes and the issue persists (see [how to disable custom nodes](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled) if you need help)

### Expected Behavior

This is a problem also other people seem to have. I work on runpod and when I switch workflows the canvas is empty. No way to restore it. Empty means that when you click on Fit View it states that the canvas is empty. All nodes are gone. The only way to restore it is to load an image or video generated which has the workflow embedded. The console does not throw an errow. This happens extremly often. Not only when you are generating. Also Memory is not the problem. So I cannot reproduce it. I also happens with every kind of workflow. Even saving does not prevent it to be cleared out.

### Actual Behavior

The Canvas is empty after switching to another workflow

### Steps to Reproduce

I cannot reproduce in a sense, that there seems to an obvious reason for this behaviour.

### Debug Logs

```powershell
No output about the issue
```

### Other

_No response_