KeyError: 'UnetLoaderGGUF' Not such error in previous v0.3.29 (17.04.2025, v2.6.0+cu126)

### 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

ComfyUI_windows_portable_nvidia.7z=v0.3.43 (28.06.2025, v2.8.0+cu128)
ComfyUI frontend version: 1.26.11
pytorch version: 2.8.0+cu128
Python version: 3.12.10 (tags/v3.12.10:0cc8128, Apr 8 2025, 12:21:36) [MSC v.1943 64 bit (AMD64)]

Error:
unetloadergguf = NODE_CLASS_MAPPINGS["UnetLoaderGGUF"]()
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
KeyError: 'UnetLoaderGGUF'
_____________________________________________________________________________________________________________________
NOTE!!!
There is not such error or any problems with earlier version ComfyUI_windows_portable_nvidia.7z=v0.3.29 (17.04.2025, v2.6.0+cu126)

### Actual Behavior

There is not such error or any problems with earlier version ComfyUI_windows_portable_nvidia.7z=v0.3.29 (17.04.2025, v2.6.0+cu126)

### Steps to Reproduce

Make script, contain unetloadergguf = NODE_CLASS_MAPPINGS["UnetLoaderGGUF"]()

### Debug Logs

```powershell
Error:
unetloadergguf = NODE_CLASS_MAPPINGS["UnetLoaderGGUF"]()
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
KeyError: 'UnetLoaderGGUF'
```

### Other

_No response_