Hi, I know sending btc over expired wallet address will be lost, (you can correct me if am wrong)
well possible to get the fund back ?
Expired means a wallet which private key has lost. Yes, no private key no fund to access. It is lost.
Once a tx get at-least 1 confirmation then it's expensive to recover the fund, once it has 6 confirmations then forget about it. In general, no funds can be back unless you have access of the fund on the wallet it is in.
Thanks for your information and it is useful ,
The system or technology can be more informative to prevent such loss like while we about to send to the expired address, it may warn us that the address is expired and fund will be lost.
That will prevent user's bad scenario.