Steps to reproduce:
# Go to any page on wiki
# Edit page and add external link like this:
[https://cs.wikipedia.org/w/index.php?title=MyPage&diff=14286854&oldid=14265839 My Page last change]
# Save and open the page in mobile view (mobile web)
# Tap the newly created link
Link redirects to mobile view diff automatically.
Link opens desktop view diff instead.