Do not recognize WebP images

### FAQ

- [x] Yes, my issue is not about [variability](https://github.com/GoogleChrome/lighthouse/blob/main/docs/variability.md) or [throttling](https://github.com/GoogleChrome/lighthouse/blob/main/docs/throttling.md).
- [x] Yes, my issue is not about a specific accessibility audit (file with [axe-core](https://github.com/dequelabs/axe-core) instead).
- [x] Yes, my issue is not answered by [other FAQs](https://github.com/GoogleChrome/lighthouse#faq).

### URL

https://pagespeed.web.dev/analysis/https-leianoticias-com-br/4e64dj9zqs?form_factor=mobile

### What happened?

I use an Nginx rule on my server that converts all images to WebP. When the server receives a request for an image like test.jpg, the response is test.jpg.webp. However, the URL of the image does not change; only the image type does.

### What did you expect?

That recognizes webpimages by type of file

### What have you tried?

_No response_

### How were you running Lighthouse?

PageSpeed Insights

### Lighthouse Version

Pagespeed

### Chrome Version

_No response_

### Node Version

_No response_

### OS

_No response_

### Relevant log output

```sh

```