In this diff:

https://en.wikipedia.org/w/index.php?title=Brush_Traction&type=revision&diff=813006460&oldid=804319362

The square brackets are reserved characters should be encoded. See

https://en.wikipedia.org/wiki/Template:Cite_web#URL

This is creating problems with WaybackMedic it can't find the end of the URL string as it interprets the square bracket as a reserved character, not part of the URL.