Problem: lots of the above warnings on various pages with links, when the user is logged in.
I dare not update my public wikis with such warnings.
Perhaps you can reproduce on your wiki with:
Login to your wiki (At revision 50055.)
$ wget -O z http://transgender-taiwan.org/index.php?title=推薦\&action=raw
and put the contents of z into a new wiki page on your wiki and view it, perhaps with purge=yes.
You may need $wgLanguageCode='zh-tw';
Putting var_dump( $regex, $trail, $m ) ; after line 1578 shows
string(0) "" string(3554) "推薦的：
UNIQ451a124442ded6bd-h-0--QINU 網站
*[http://intermargins.net/ 國際邊緣]及其[http://intermargins.net/repression/
deviant/transgender/trans_index.htm 跨性別頁]
Version: 1.15.x
Severity: major