When resolving T211494 a typo was introduced in change 478473 (https://gerrit.wikimedia.org/r/#/c/operations/mediawiki-config/+/478473/3/wmf-config/CommonSettings.php)
In CommonSettings.php
$wgExtraNamespaces[447] = 'Educaton_Program_talk';
should be
$wgExtraNamespaces[447] = 'Education_Program_talk';