I stumbled upon a link to
https://wikimediafoundation.org/wiki/Donate/en
which, to my surprise, led me to
https://wikimediafoundation.org/2016/04/25/engaging-librarians-1lib1ref/
which is clearly unrelated to the intent of the link.
The old behaviour for that link was a redirect to
https://donate.wikimedia.org/w/index.php?title=Special:LandingPage (with the appropriate tags)
I think this issue is UBN-worthy, given it can turn away donations.