IABot has started replacing the + character with %20 (space) in archiveurls. These are not equivalent characters, and in some cases makes the archiveurl no longer functional:
https://en.wikipedia.org/w/index.php?title=Yawkey_(MBTA_station)&curid=13271384&diff=780023300&oldid=757084321
https://en.wikipedia.org/w/index.php?title=Porter_(MBTA_station)&curid=966328&diff=780004334&oldid=766578010