We revisited Kleppmann’s work on MySQL isolation levels and found surprising behavior in 8.0.34. MySQL’s REPEATABLE READ not only exhibits G2-item, G-single, and lost update, but also violates internal consistency and Monotonic Atomic View. It satisfies neither Adya’s Repeatable Read nor the ambiguous ANSI SQL definition. We also discovered AWS RDS MySQL clusters routinely violate Serializability at the SERIALIZABLE isolation level.