Because it's not in the CVS I can't say if it is a bug, but tring the link I seen that it works even without the last bracket ")".
I'm not sure I know what you mean...
On a page "bla (this)", it will show links to "bla (that)", "bla (etc)" and so on, as well as to "bla" itself (usually the main topic or disambiguation page).
I just expanded the function so it won't run on a page like "bla (this", and it won't show links to such pages (closing ")" is required).
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