Odaily News ZKsync posted a reminder on the X platform that during the protocol upgrade v26, there was a temporary problem with the backward compatibility of the Mailbox contract, which would affect L1 → L2 transactions. Since the bridge and L2 are in different transition stages, backward compatibility does not work for the time being. It may take 1.5-2 weeks to solve this problem. Therefore, it is recommended that users use "requestL2TransactionDirect requestL2TransactionTwoBridges" on BridgeHub instead of Mailbox. It is also recommended to migrate to BridgeHub to avoid the Mailbox contract being deprecated in the future.