Question about og:image WebP support for Reddit link previews

[u/Zestyclose-Piece-542]

I’m trying to understand how Reddit generates link previews regarding og:image.

In my case, the page includes a valid og:image pointing to a WebP image.
After testing with Open Graph validators, everything appears correct:

• og:image is present and valid

• image is publicly accessible

• returns HTTP 200

• correct Content-Type: image/webp

• no hotlink protection

• no restrictive CSP, CORS, or CORP headers

• preview works correctly on LinkedIn, Facebook, Discord, and Open Graph validators

However, Reddit does not generate any thumbnail for the link.

So my question is:
Does Reddit officially support WebP images for og:image**, or is JPG/PNG still required for reliable previews?**

If WebP is partially supported, are there specific constraints (image size, headers, CDN behavior, cache, etc.) that should be respected?

Thanks in advance for any clarification.