Visited Hyperlinked code (backticks) in spoilers is not hidden

On Beta Stack Exchange sites, spoilered text is visible when it shouldn't be, when

• the text is code (in backticks),
• the text is part of a hyperlink,
• and the hyperlink is visited

Example:

>! blah blah blah [You've probably visited this link; This text should be invisible! foobar](http://meta.stackoverflow.com/) blah


displays as

I noticed this after submitting my answer http://codegolf.stackexchange.com/a/6767/2276.

Similar to When editing an answer with spoilers, the links are not hidden in the markdown preview, but in this case the actual post is affected, not just the preview.

I think this issue is in the CSS for the Beta Stack Exchange sites (incl. their metas), because I tried it on Japanese Meta and saw the same problem.

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No repro here on meta, but I see the problem on your codegolf answer after visiting that link. –  blahdiblah Jul 26 '12 at 2:21
@blahdiblah: You're right, but it's not just codegolf, but seemingly all (?) Beta sites. Updated. –  Mechanical snail Jul 26 '12 at 2:31
Wow, is there a badge for finding esoteric bugs?! –  Benjol Jul 26 '12 at 10:57