Posted originally at https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(proposals) :
User A writes the last good revision to page "Foo". User B maliciously changes the content model of "Foo" from wikitext to CSS. User C edits the page in good faith. User D would like to revert to User A's revision without knowledge of Special:ChangeContentModel. (as not required by the undo/rollback cases tested so far)
Bug: User D is unable to do so.
A page set up with this scenario is at https://test2.wikipedia.org/wiki/Law3 (https://test2.wikipedia.org/w/index.php?title=Law3&oldid=296990)