"Known transaction" Error on eth_sendRawTransaction, but Transaction is Successfully Submitted

[andremfaria]

Hello,

We are using ethers.js 6.13.4 in our project, and since some days ago, we started encountering an issue when submitting transactions:

{"code":"UNKNOWN_ERROR","error":{"code":-32000,"message":"Known transaction"},"payload":{"method":"eth_sendRawTransaction","params":["0x0"],"id":9,"jsonrpc":"2.0"},"shortMessage":"could not coalesce error"}

This error occurs intermittently, and I have verified that there are no concurrent transactions being sent at the same time.

The main issue is that even when this error occurs, the transaction is still successfully submitted to the blockchain.

This behaviour is specifically happening on Linea mainnet.

I suspect this could be related to the node provider (Infura) or the mempool, but if that's the case, there also seems to be an issue on the ethers.js side, as it throws an error even though the transaction was successfully submitted.

Has anyone else experienced a similar issue recently?
Thanks