+* Some external link searches will not work correctly until update.php (or
+ refreshExternallinksIndex.php) is run. These include searches for links using
+ IP addresses, internationalized domain names, and possibly mailto links.
+* (T193868) $wgChangeTagsSchemaMigrationStage — This temporary setting, added in
+ MediaWiki 1.32, now defaults to MIGRATION_NEW instead of MIGRATION_WRITE_BOTH.