Today I was browsing a tag here and I noticed that on the first pages, all questions are shown with thumbnails (most of the time, just the default one):
However, from page 5 on the formatting is like on other Stack Exchange sites, showing votes, answers and views instead of the thumbnail:
It does not seem to matter whether a template is being used; this app of mine doesn't use it but it's still shown with a default thumbnail.
The behaviour is reproducible for a few other tags, e.g. [greasemonkey].