I don’t know, what I noticed is that the excerpt field from the JSON payload doesn’t have links stripped out.
Plus, the Topic List Previews plugin author, @merefield, also had some issues with excerpts with links recently: Excerpts are being poisoned by onebox URL's on Post Rebuild
EDIT: You’re right @awesomerobot, this is a specific issue with the Topic List Previews. I just disabled it on my instance and the issue is gone, it looks like TLP is overriding the default excerpt serializer because now that I’ve disabled it, all links are stripped out from the JSON payload. I guess this is happening here, but I’m not sure.
This is not a Discourse bug, sorry for the confusion. Should I delete the original post, leave it here for posterity, what do you suggest?
Thanks.