DxSale said the exploit was caused by a compatibility issue between BNB Chain atomic transactions and its 2021 v1 lock contracts. The platform said about 1,400 old LPs on BNB Chain lost $7.3 million on May 29. DxSale added that only the legacy v1 contracts were affected, while v2 and later lock contracts, which were audited by CertiK, were unaffected.