When I save a page on the English Wikipedia, I'm currently redirected to a URL that contains incomprehensible garbage. Example after editing a section on a user talk page: https://en.wikipedia.org/w/index.php?title=User_talk:Kirill_Lokshin&pe=1&#You.27re_invited_to_Masterpiece_Museum_Edit-a-Thon.21.
The URL has been rewritten from example.com/wiki/ syntax to the far worse example.com/w/index.php syntax. It now also includes "&pe=1", which makes sense to no one.
URLs are very important. They're heavily passed around on the Internet. Unless you have a really good reason to be messing around with them and inserting garbage into them, PLEASE DON'T DO IT.
I believe this particular garbage is coming from the E3 team. I see absolutely no reason it should be doing this for my user account.