Open this link and inspect any collapsed lines.
https://en.wikipedia.org/wiki/Special:RecentChanges?hidebots=1&hidepageedits=1&hidenewpages=1&hideWikibase=1&hidelog=1&enhanced=1&urlversion=2
Example:
- 22:24 [[https://en.wikipedia.org/wiki/Category:Midtown_Manhattan|Category:Midtown Manhattan]] (2 changes) . . [ [[https://en.wikipedia.org/wiki/User:Ser_Amantio_di_Nicolao|Ser Amantio di Nicolao]] (2×) ]
-- [[https://en.wikipedia.org/w/index.php?title=Category:Midtown_Manhattan&curid=9288855&oldid=995594781|22:24]] . . [[https://en.wikipedia.org/wiki/User:Ser_Amantio_di_Nicolao|Ser Amantio di Nicolao]] ([[https://en.wikipedia.org/wiki/User_talk:Ser_Amantio_di_Nicolao|talk]] | [[https://en.wikipedia.org/wiki/Special:Contributions/Ser_Amantio_di_Nicolao|contribs]]) //([[https://en.wikipedia.org/wiki/3_Park_Avenue|3 Park Avenue]] removed from category, [[https://en.wikipedia.org/wiki/Special:WhatLinksHere/3_Park_Avenue|this page is included within other pages]])//
-- [[https://en.wikipedia.org/w/index.php?title=Category:Midtown_Manhattan&curid=9288855&oldid=995594739|22:23]] . . [[https://en.wikipedia.org/wiki/User:Ser_Amantio_di_Nicolao|Ser Amantio di Nicolao]] ([[https://en.wikipedia.org/wiki/User_talk:Ser_Amantio_di_Nicolao|talk]] | [[https://en.wikipedia.org/wiki/Special:Contributions/Ser_Amantio_di_Nicolao|contribs]]) //([[https://en.wikipedia.org/wiki/Lexington_Avenue|Lexington Avenue]] added to category, [[https://en.wikipedia.org/wiki/Special:WhatLinksHere/Lexington_Avenue|this page is included within other pages]])//
Compare it to grouped lines for ordinary edits, and notice "(cur | prev)" are missing even though diff links for non-grouped category changes are available at the end of each line (with broken history links, see T264491). Also there are no history links, and `title` and `curid` in the permalinks (timestamps) are wrong (`title` is that of the category and the second `curid` is same as the first—this part being tracked as T270774).
So it should be more like:
- 22:24 [[https://en.wikipedia.org/wiki/Category:Midtown_Manhattan|Category:Midtown Manhattan]] (2 changes) . . [ [[https://en.wikipedia.org/wiki/User:Ser_Amantio_di_Nicolao|Ser Amantio di Nicolao]] (2×) ]
-- [[https://en.wikipedia.org/w/index.php?title=3_Park_Avenue&curid=9288855&oldid=995594781|22:24]] ([[https://en.wikipedia.org/w/index.php?title=3_Park_Avenue&curid=9288855&diff=0&oldid=995594781|cur]] | [[https://en.wikipedia.org/w/index.php?title=3_Park_Avenue&curid=9288855&diff=995594781&oldid=995594692|prev]]) . . [[https://en.wikipedia.org/wiki/User:Ser_Amantio_di_Nicolao|Ser Amantio di Nicolao]] ([[https://en.wikipedia.org/wiki/User_talk:Ser_Amantio_di_Nicolao|talk]] | [[https://en.wikipedia.org/wiki/Special:Contributions/Ser_Amantio_di_Nicolao|contribs]]) //([[https://en.wikipedia.org/wiki/3_Park_Avenue|3 Park Avenue]] removed from category, [[https://en.wikipedia.org/wiki/Special:WhatLinksHere/3_Park_Avenue|this page is included within other pages]])// ([[https://en.wikipedia.org/w/index.php?title=3_Park_Avenue&curid=9288855&action=history|hist]])
-- [[https://en.wikipedia.org/w/index.php?title=Lexington_Avenue&curid=1336073&oldid=995594739|22:23]] ([[https://en.wikipedia.org/w/index.php?title=Lexington_Avenue&curid=1336073&diff=0&oldid=995594739|cur]] | [[https://en.wikipedia.org/w/index.php?title=Lexington_Avenue&curid=1336073&diff=995594739&oldid=995594662|prev]]) . . [[https://en.wikipedia.org/wiki/User:Ser_Amantio_di_Nicolao|Ser Amantio di Nicolao]] ([[https://en.wikipedia.org/wiki/User_talk:Ser_Amantio_di_Nicolao|talk]] | [[https://en.wikipedia.org/wiki/Special:Contributions/Ser_Amantio_di_Nicolao|contribs]]) //([[https://en.wikipedia.org/wiki/Lexington_Avenue|Lexington Avenue]] added to category, [[https://en.wikipedia.org/wiki/Special:WhatLinksHere/Lexington_Avenue|this page is included within other pages]])// ([[https://en.wikipedia.org/w/index.php?title=3_Park_Avenue&curid=1336073&action=history|hist]])
with
- "cur" and "prev" diffs
- "hist" link
- correct `title`
- correct `curid`
See also the corollary {T148533}.