IT wiki:
You can see it [[ https://it.wikipedia.org/w/index.php?title=Utente%3AElitre_%28WMF%29%2FSandbox&type=revision&diff=75707174&oldid=75694517 | here ]].
(I also put [[ https://en.wikipedia.org/w/index.php?title=User%3AElitre_%28WMF%29%2FSandbox&type=revision&diff=685552361&oldid=685551640 | the same citations at en.wiki ]] in case it's useful or interesting for you to see the different outcome.)
A solution to a similar issue is discussed in https://phabricator.wikimedia.org/T97256#1248815 .
PL wiki:
https://www.mediawiki.org/w/index.php?title=Topic:Sgikbv81nxsv7oy6&topic_showPostId=sqt0thxnx0gx69xc#flow-post-sqt0thxnx0gx69xc
EN wiki:
VE is setting the language in {{cite}} templates. It's setting it to en-US, en-GB and other flavours which are not recognized by {{cite}}. Also, these shouldn't be set if the language and wiki are the same languages. On enwiki, these errors end up in [[Category:CS1 maint: Unrecognized language]]
CS wiki:
Per community discussion [[https://cs.wikipedia.org/w/index.php?title=Wikipedie:Pod_l%C3%ADpou_(technika)&oldid=14617707#Jazyk_v_cita.C4.8Dn.C3.ADch_.C5.A1ablon.C3.A1ch|here]], spotted also with another problem described in T156548
Examples are:
https://en.wikipedia.org/w/index.php?title=Chris_Harris_(Automotive_Journalist)&action=edit&oldid=688324259
https://en.wikipedia.org/w/index.php?title=Adam_Waito&type=revision&diff=685374219&oldid=685373324
https://en.wikipedia.org/w/index.php?title=Aijia&type=revision&diff=681819929&oldid=681818020