On Wikispecies, the data in [[https://species.wikimedia.org/wiki/Special:LonelyPages|species:Special:LonelyPages]] (Orphaned pages) was last updated on 25 September 2023.
I checked other wikis, and the data in a number of them was also last updated on 25 September 2023, while in the others it was updated recently.
(a) last updated 25 September
* itwiktionary: [[https://it.wiktionary.org/wiki/Speciale:PagineOrfane|wikt:it:Speciale:PagineOrfane]] — last updated 12:47, 25 September 2023
* incubatorwiki: [[https://incubator.wikimedia.org/wiki/Special:LonelyPages|incubator:Special:LonelyPages]] — last updated 10:38, 25 September 2023
* mediawikiwiki: [[https://www.mediawiki.org/wiki/Special:LonelyPages|mw:Special:LonelyPages]] — last updated 12:07, 25 September 2023
(b) updated recently
* itwiki: [[https://it.wikipedia.org/wiki/Speciale:PagineOrfane|w:it:Speciale:PagineOrfane]] — last updated 07:45, 7 October 2023
* metawiki: [[https://meta.wikimedia.org/wiki/Special:LonelyPages|m:Special:LonelyPages]] — last updated 06:19, 7 October 2023
* wikifunctionswiki: [[https://www.wikifunctions.org/wiki/Special:LonelyPages|f:Special:LonelyPages]] — last updated 06:02, 7 October 2023
Is this a bug or a change in the update frequency? According to a post at [[https://species.wikimedia.org/wiki/Wikispecies:Village_Pump#Orphaned_pages_update|species:Wikispecies:Village Pump#Orphaned pages update]], the data in Special:LonelyPages used to be updated twice a week. Thanks.