### Bug Description
frp has a bug where it sends a FIN ACK packet in response to a client's FIN packet, causing the server to be unable to send subsequent data packets to the client. This issue is demonstrated with an example client and server code, which works as expected when running on the same machine but fails when using frp for port forwarding.
### frpc and frps Versions
frpc version: 0.62.0
frps version: 0.62.0
### System Architecture
frps: Linux (amd64)
frpc: Windows (amd64)
### Configurations
#### Server Code
```go
package main
import (