flux fill onereward int8-convrot generated Artifact during inpaint

### 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

int8-convrot better or as fp8 model

### Actual Behavior

flux fill onereward int8-convrot generated Artifact during inpaint

### Steps to Reproduce

1. original model: https://huggingface.co/Comfy-Org/OneReward_repackaged/blob/main/split_files/diffusion_models/flux.1-fill-dev-OneReward-transformer_bf16.safetensors
2. convert script: https://github.com/Comfy-Org/comfy-model-tools/blob/main/quant_int8_convrot.py
3. no parameter used during convert
4. change to int8-convrot model in dit loader(official), changed dtype to default

### Debug Logs

```powershell
...
```

### Other

not sure where the the problem is, script/comfyui/parameter?

Start with the linked comfy-model-tools/quant_int8_convrot.py conversion script and reproduce the reported flux fill inpaint case using the original OneReward bf16 model. Then inspect the official ComfyUI dit loader with the converted int8-convrot model and default dtype; done means identifying whether the artifact comes from conversion, loading, or dtype handling.

Written by the indexing model from the issue text.