[0.27.2]: from_single_file: 'AutoencoderKL' object has no attribute '__name__'. Did you mean: '__ne__'?

### Describe the bug

finetune a dreambooth model with ED2 but can't load with 0.27.2

the model work with a1111

### Reproduction

pipe.from_single_file

https://huggingface.co/crapthings/diffusers-issue/resolve/main/base-ed2.safetensors

### Logs

_No response_

### System Info

pip install diffusers==0.27.2

### Who can help?

_No response_

Start by reproducing the failure with diffusers==0.27.2 using pipe.from_single_file and the linked base-ed2.safetensors model. Trace the path involving the AutoencoderKL object and the reported __name__ access, then compare the failing load with the stated working behavior in a1111. Done means the ED2 model loads through from_single_file without this AttributeError.

索引モデルが issue の本文から書いたものです。