Wikimedia Bugzilla is closed!

On Special:Categories, the intuitive thing is to try Special:Categories?from=Houses and expect a response like:

* [[Category:Houses]]
* [[Category:Houses in Bulgaria]]
* [[Category:Houses in California]]
...

In fact, one gets:
* [[Category:Houses in Bulgaria]]
* [[Category:Houses in California]]
...

Because Houses is supplied as an offset to index pager, and as we know, the the offset is search non-inclusively. Hence, it doesn't show.

This is fine for many other special pages. CategoryPager should probably be adjusted to not make this mistake, however; Special:PrefixIndex already uses custom code to ensure this.