The parenthesis that ends the url of [this comment](https://english.stackexchange.com/questions/14265/what-does-something-101-mean#comment24047_14265) seems not to be considered as part of the link.

The same bug bug was [reported on Meta StackOverflow](https://meta.stackexchange.com/questions/2323/please-improve-the-auto-linking-to-allow-square-and-round-brackets/2346) and apparently corrected.