Repository: stable-diffusion-webui
Issue: [Bug]: Checkpoint previews/thumbnails do not display
Labels: bug-report

### Is there an existing issue for this?

- [X] I have searched the existing issues and checked the recent builds/commits

### What happened?

No matter what I do, the previews for checkpoints, loras and anything similar do not render. Instead they show a gray image that says "NO PREVTFH" 
![image](https://github.com/AUTOMATIC1111/stable-diffusion-webui/assets/145929472/30c68ab1-bb71-4a75-9d02-a66fad67b667)

Even though I have named correctly and in the right place, they just don't show up
![image](https://github.com/AUTOMATIC1111/stable-diffusion-webui/assets/145929472/6e8b0950-adab-4051-bd7b-b3da195c45a6)

Extensions like Civitai Helper were able to download and name the images properly, but still didn't render them
![image](https://github.com/AUTOMATIC1111/stable-diffusion-webui/assets/145929472/6e9927b7-b499-47e4-a7b5-18b33e3ad3a8)

The Model Previews extension hoverer, IS able to grab them, so I belive the issues lies in Automatic1111
![image](https://github.com/AUTOMATIC1111/stable-diffusion-webui/assets/145929472/d9f1a1b2-c482-4e25-9405-dd6605cb930f)



### Steps to reproduce the problem

1. Go to the webui
2. Press text2img
3. Press Checkpoints
4. ??? No one else seems to be having this issue, so I cannot say with certainty how to replicate it. I did a fresh install of Automatic1111 yesterday and still had the issue if that helps


### What should have happened?

The thumbnails in the Checkpoints tab should display previews

### Sysinfo

this doesn't seem to be working either...
![image](https://github.com/AUTOMATIC1111/stable-diffusion-webui/assets/145929472/09c92ae9-d45e-4be4-9724-c70f8ab82360)
![image](https://github.com/AUTOMATIC1111/stable-diffusion-webui/assets/145929472/2b6d8cac-0125-4f8b-ae03-9d481e00797e)


### What browsers do you use to access the UI ?

Google Chrome

### Console logs

```Shell
venv "C:\ai\new clean stable\stable-diffusion-webui\venv\Scripts\Python.exe"
Python 3.10.6 (tags/v3.10.6:9c7b4bd, Aug  1 2022, 21:53:49) [MSC v.1932 64 bit (AMD64)]
Version: v1.6.0
Commit hash: 5ef669de080814067961f28357256e8fe27544f4
You are up to date with the most recent release.
Launching Web UI with arguments: --autolaunch --update-check
no module 'xformers'. Processing without...
no module 'xformers'. Processing without...
No module 'xformers'. Proceeding without it.
Civitai Helper: Get Custom Model Folder
Civitai Helper: Load setting from: C:\ai\new clean stable\stable-diffusion-webui\extensions\Stable-Diffusion-Webui-Civitai-Helper\setting.json
Civitai Helper: No setting file, use default
Model Downloader v1.0.8
Checking Directories...
all Directories already Created.
2023-09-24 13:20:03,640 - ControlNet - INFO - ControlNet v1.1.410
ControlNet preprocessor location: C:\ai\new clean stable\stable-diffusion-webui\extensions\sd-webui-controlnet\annotator\downloads
2023-09-24 13:20:03,755 - ControlNet - INFO - ControlNet v1.1.410
Loading weights [94544f1a64] from C:\ai\new clean stable\stable-diffusion-webui\models\Stable-diffusion\spiritmixSoftAndCutesy2_CS2.safetensors
C:\ai\new clean stable\stable-diffusion-webui\extensions\sd-webui-ar\scripts\sd-webui-ar.py:433: GradioDeprecationWarning: The `style` method is deprecated. Please set these arguments in the constructor instead.
  arc_calc_height = gr.Button(value="Calculate Height").style(
C:\ai\new clean stable\stable-diffusion-webui\extensions\sd-webui-ar\scripts\sd-webui-ar.py:433: GradioDeprecationWarning: Use `scale` in place of full_width in the constructor. scale=1 will make the button expand, whereas 0 will not.
  arc_calc_height = gr.Button(value="Calculate Height").style(
C:\ai\new clean stable\stable-diffusion-webui\extensions\sd-webui-ar\scripts\sd-webui-ar.py:441: GradioDeprecationWarning: The `style` method is deprecated. Please set these arguments in the constructor instead.
  arc_calc_width = gr.Button(value="Calculate Width").style(
C:\ai\new clean stable\stable-diffusion-webui\extensions\sd-webui-ar\scripts\sd-webui-ar.py:441: GradioDeprecationWarning: Use `scale` in place of full_width in the constructor. scale=1 will make the button expand, whereas 0 will not.
  arc_calc_width = gr.Button(value="Calculate Width").style(
C:\ai\new clean stable\stable-diffusion-webui\extensions\sd-model-downloader\scripts\model-downloader.py:309: GradioDeprecationWarning: The `style` method is deprecated. Please set these arguments in the constructor instead.
  image.style(width=156, height=234)
Creating model from config: C:\ai\new clean stable\stable-diffusion-webui\configs\v1-inference.yaml
Applying attention optimization: sdp-no-mem... done.
Model loaded in 3.7s (load weights from disk: 0.5s, create model: 0.4s, apply weights to model: 1.1s, load textual inversion embeddings: 0.9s, calculate empty prompt: 0.8s).
Running on local URL:  http://127.0.0.1:7860
Running on public URL: https://685e7aef4e70544d7c.gradio.live

This share link expires in 72 hours. For free permanent hosting and GPU upgrades, run `gradio deploy` from Terminal to deploy to Spaces (https://huggingface.co/spaces)
```


### Additional information

_No response_