[[https://en.wikipedia.org/w/index.php?title=Module:Submit_an_edit_request&diff=912134837&oldid=885217646|This edit on the English Wikipedia]] caused the "Submit an edit request" button to begin going to URLs like `https://en.wikipedia.org/w/index.php?title=Special%3ANewSection%2FTemplate_talk%3ASubmit_an_edit_request&preload=Template%3ASubmit+an+edit+request%2Fpreload&editintro=Template%3AEdit+protected%2Feditintro&preloadtitle=Protected+edit+request+on+23+August+2019&preloadparams%5B%5D=edit+fully-protected&preloadparams%5B%5D=Template%3ASubmit+an+edit+request`. The redirect from Special:NewSection drops the preloadparams parameter, preventing the `$1` and `$2` from being replaced in the preload text.
Go to https://en.wikipedia.org/wiki/Selman_Akbulut, and click "View Source". Click "Submit an edit request". Following the directions on this page creates "Template:$1" in a new section, which does not exist.
Example result: https://en.wikipedia.org/w/index.php?title=Talk:Selman_Akbulut&diff=next&oldid=912140199