Following the database migration on Sunday, wiki creations now fail with an error like the one below:

[1daab0f0e0c3a17f6a5dc2b2] 2020-03-10 14:25:19: Fatal exception of type "Wikimedia\Rdbms\DBQueryError"

However, when this happens, the wiki is still created, but the main page does not exist, and the account of the requester is not attached nor granted privileges.