Since gerrit 90892 the  for accesskeys are used from message 'brackets', when using other brackets (like '()') there, the regex in module jquery.accessKeyLabel gets not matched, because the  are hard coded. Same for the word-seperator, when no space is used the regex will also not match:
oldTitle.replace( / \[.*?\]$/, '' )
After fix of bug 48505 there are now two accesskey hints. The default accesskey hint and one with  and the right buttons (like alt or ctrl), because it is always added.