This will help identify the issue if you added it to $wgAuthManagerConfig.
* wfSplitWikiId() is now deprecated. Cache key generation should have the wiki
domain ID as a key component and use makeGlobalKey().
+* (T202094) Title::getUserCaseDBKey() is deprecated; instead, please use
+ Title::getDBKey(), which doesn't vary case.
* …
=== Other changes in 1.33 ===