Not all variants in a tag combi shown on tag page

I've seen this happen more often, but this one is a clear example : http://www.librarything.com/tag/giappone. The tag page only shows Giappone and Japan (日本) as being represented in that tag combi, while if you try other variants - like "Nippon" - you are being taken to that same tag page (so that must be in there somewhere too).

p.s.: also it doesn't show that I'm actually using the tag "Japan". But that may be another bug.

This is the same bug that I reported here. So I'm closing this one.

Okay.

Fixed. (And in that one word hides two days of work! Fortunately, the reengineering was good generally.)