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Maybe we can find some more famous examples where this bug causes trouble
This sa=X business was mentioned a while back, but I hadn't noticed that it actually breaks some links -- even for Google itself. Good observation!
Why they are keeping that part of the query string, even after passing the click through their own tracking script, is very confusing to me. I sure hope they don't start indexing those urls.
Now they malform the url with two "?" by constructing it like this:
I would love (and kind of expect) a fix at their end.