Occasionally wiki links are being mangled adding ./ to the start and replacing spaces with underscores. For example replacing [[specific name (zoology)|specific epithet]] with [[./Specific_name_(zoology)|specific epithet]]. I've only noticed it with piped links.
Examples
https://en.wikipedia.org/w/index.php?title=Austropotamobius_pallipes&curid=3945333&diff=562783871&oldid=545518009
https://en.wikipedia.org/w/index.php?title=Ron_Davies_(songwriter)&curid=31118393&diff=562723238&oldid=553701771
https://en.wikipedia.org/w/index.php?title=Sibling_relationship&curid=22409572&diff=562636237&oldid=561958868
https://en.wikipedia.org/w/index.php?title=Double_Rainbow_(viral_video)&curid=28129724&diff=562626607&oldid=560477885
https://en.wikipedia.org/w/index.php?title=Roger_Mompesson&curid=39389398&diff=562625481&oldid=560045122 (also changed a category link)
possibly related to bug 50428
Version: unspecified
Severity: minor
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=50539
https://bugzilla.wikimedia.org/show_bug.cgi?id=48769