On tag wiki pages there is a "tag preview", which shows the 8 latest members of a tag, and filters out the deleted images.
It shouldn't filter out the deleted images when the "Show deleted posts" option is enabled at least.
Other previews work the same way, someone's latest 6 uploads, and latest 6 favorites show deleted pictures too.
It is annoying, and confusing, especially when it shows no pictures at all, while there are pictures of something/someone.