VAE Encode with Qwen Image VAE Ignores Batched Images

### 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

When using any VAE model, batching images, then VAE encoding, then VAE decoding results in that same batch of images.

### Actual Behavior

When doing the same process with Qwen Image VAE, it ignores the batch of images and only encodes 1 image.

### Steps to Reproduce

### Debug Logs

```powershell
N/A
```

### Other

_No response_