All Ksampler Previews have stopped Working (whether Latent or Taesd) - New Versions 3.50 & 3.51

### Custom Node Testing

- [x] 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

The Ksampler previews should work as before Version 3.50.

### Actual Behavior

Since the latest Version 3.50 all Ksampler previews have stopped working (whether Latent or Taesd).

### Steps to Reproduce

Every workflow run no longer has Ksampler previews.

### Debug Logs

```powershell
There is a log meesage Warning: TAESD previews enabled, but could not find models/vae_approx/None even though all the TAESD VAE files are still there.
```

### Other

_No response_