Thread:Project:Support desk/Special:NewPages displays zero results

After upgrading to MW 1.24.1 (from 1.21), Special:NewPages now displays zero results. If I create a new page right now, it shows up in Special:NewPages, but anything before the upgrade is not listed.

New pages are listed on Special:RecentChanges with an "N" next to them, so clearly something in MediaWiki knows they're new.

I ran maintenance/rebuildrecentchanges.php but it had no effect on Special:NewPages.

I've installed four other 1.24.1 wikis without having this problem. Disabling all extensions does not help. Any advice appreciated!

I filed this as a bug in Phabricator, and someone there recommended posting it here in Support Desk.