[XTDfjApAAEIAAHL3um4AAAAR] 2019-07-18 21:07:25: Fatal exception of type "Wikimedia\Rdbms\DBQueryError"
I tried the same move again, and got:
[XTDftwpAIC4AAJwJyIkAAABW] 2019-07-18 21:08:16: Fatal exception of type "Wikimedia\Rdbms\DBTransactionSizeError" (write duration was 4.0942652225494)
I tried a third time, and the moves worked: page move, associated talk page