Hm, the new image formatting in old.lemmy.zip (adding lemmy.zip/api/v3/image_proxy?url= before all the link addresses) is no longer recognizable by my auto picture zoom extension (Imagus). It also removed most of the "plus" boxes by the posts that expand the contents--they're still present for posts with text but not image posts.
Looks like non-old lemmy.zip is working normally as before though.
Sadly the old interface isn't supported by its dev anymore, so is becoming more and more unusable. I believe it won't work at all with lemmy 1.0 because of all the API changes :(