When a namespace is removed, cleanupTitles.php doesn't affect deleted pages which were deleted from that namespace, and then they become unaccessible and cause weird UI quirks (see e.g. T387805: Special:Undelete shows wrong permission error when viewing deleted contributions in an undefined namespace).
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Not sure this task is a fit for Interfaces, but it's not obvious to me which team might be able to pick it up. Is there a particular team responsible for maintenance scripts?