$specialPageAliases configuration in MessagesZh_hant.php is not working on zhwiki.
For example $specialPageAliases['Activeusers'].
Set '活跃用户' in https://gerrit.wikimedia.org/g/mediawiki/core/+/c7ca79509d85f3c205d61eb7fdcb2722fa56c4e7/languages/messages/MessagesZh_hans.php#135
Set '活躍使用者' in https://gerrit.wikimedia.org/g/mediawiki/core/+/c7ca79509d85f3c205d61eb7fdcb2722fa56c4e7/languages/messages/MessagesZh_hant.php#119
But
https://zh.wikipedia.org/wiki/Special:活跃用户 is available.
https://zh.wikipedia.org/wiki/Special:活躍使用者 is "No such special page".