No, lemmy.zip converts it to avif, the original is jpg, this is the link of the image you posted: https://i.redd.it/sg3ssz188iig1.jpeg
I don't know if the problem is on lemmy's side, or reddit rate limits us or something. But we shouldn't give clicks to reddit anyway.
Also if the post will be deleted on reddit it will stop working here as well, so it's more future proof if you mirror it to here or somewhere else.