I’m not sure whether this is an Mbin or Lemmy bug, but it looks like there’s some sort of breakage involving their interaction.
A user on an Mbin home instance (fedia.io) submitted a post to a community on a Lemmy instance (beehaw.org).
https://beehaw.org/post/23981271
When viewed via the Web UI on Lemmy instances (at least all the ones, I tried, lemmy.today, lemmy.ml, and beehaw.org), as well as at least Eternity on lemmy.today this post is a link to an image, possibly proxied via pict-rs if the instance does such proxying:
https://fedia.io/media/93/77/937761715da35c5c9fb1267e65b4ea54c2b649c2eebbf8ce26d2b4cba20097bf.jpg
https://beehaw.org/post/23981271
https://lemmy.ml/post/41016280
https://lemmy.today/post/44629301
It contains no link to the URL that the submitter intended to link to.
When viewed via the PiedFed Web UI (checking using olio.cafe) or, based on what I believe to be the case from other responses, the Mbin Web UI, the post apparently links to the intended URL in a link beneath the title:
https://www.tomshardware.com/tech-industry/artificial-intelligence/chatgpt-could-prioritize-sponsored-content-as-part-of-ad-strategy-sponsored-content-could-allegedly-be-given-preferential-treatment-in-llms-responses-openai-to-use-chat-data-to-deliver-highly-personalized-results
Just wanted to make the devs aware of the interaction.

Mbin now includes both a image and a link in the Page attachments array. Lemmy only looks at the first element in that array, which is always the image, so the link is dropped.