original report and steps to reproduce
Revision 666058325 on en.wikipedia.org was hidden.
As such, the diff for it cannot be viewed. Both Vector and Minerva show a relevant message to reflect this fact:
However the edit before and after it can also not be viewed. On desktop, it shows the same message
But MobileDiff shows an empty page:
The behaviour between https://en.m.wikipedia.org/wiki/Special:MobileDiff/666058337 and https://en.wikipedia.org/w/index.php?title=Wikipedia&diff=prev&oldid=666057460 is different. With a little investigation it should be clear why (they share the same code)
Specifically the text "You cannot view this diff because one or both of the revisions have been removed from the public archives. Details can be found in the deletion log for this page. " should be shown
- MobileDiff should appear as usual
Visit http://reading-web-staging.wmflabs.org/wiki/Special:MobileDiff/44 as anon - you should be informed it is not possible to view the revision.