nano banana pro - generating images are full black - no image generated

### 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

It should generate a ikmage instead of creating a blank balck images, credits should be resturned in this scenario.

### Actual Behavior

when i try to generate aimage through nano banan api im getting black images but credits are simply taken but no error throughs, prompts are very simple and no vulgar or any unwanted prompt. need a solution.

### Steps to Reproduce

take a rice grain and try to convert that into a realistic character with face.

### Debug Logs

```powershell
[ComfyUI-Manager] default cache updated: https://api.comfy.org/nodes
FETCH DATA from: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json [DONE]
[ComfyUI-Manager] All startup tasks have been completed.
got prompt
Prompt executed in 39.96 seconds
got prompt
Prompt executed in 53.73 seconds
```

### Other

_No response_