With the new properties comes a new implementation of the related special pages. Now all properties that are used somewhere (whether or not declared correctly) are shown. Properties that still will not appear are the following:

• Properties that have a property page but are not used on any page (these can be found on another special page for unused properties). This is the same as for categories.
• Properties that have a page that gives a special datatype, but that are used only wrongly throughout the wiki. This means that *all* values that have been given to the property throughout the wiki are invalid under the datatype (e.g. the type expects a number but no number was given). Then nothing can be stored and the property will also appear only as "unused property".

The second case should be reasonably rare and is also reflected by error messages in the factboxes of the respective articles.