ncat closes connection prematurely on WSL2 unless --keep-open is specified

### Windows Version

Microsoft Windows [Version 10.0.26200.7019]

### WSL Version

2.6.1.0

### Are you using WSL 1 or WSL 2?

- [x] WSL 2
- [ ] WSL 1

### Kernel Version

6.6.87.2-microsoft-standard-WSL2

### Distro Version

Ubuntu 24.04

### Other Software

Ncat: Version 7.94SVN ( https://nmap.org/ncat )

### Repro Steps

1. Run `ncat -v -l 12345` in one terminal.
2. Run `ncat -v 127.0.0.1 12345` in another terminal.
3. Observe that the first terminal correctly shows `Ncat: Connection from 127.0.0.1:46128.` or similar.
4. Try to send `hello` from the second terminal (enter `hello` and press Enter).
5. Observe that the second `ncat` command terminated with error `Ncat: Connection reset by peer.`.

* If you try the same with extra option `--keep-open` in the first terminal, it all works as expected.
* If you try the same with the first terminal using a WSL1 distro, it all works as expected.
* If you try the same with `nc` instead of `ncat`, it all works as expected.

Note: I am using mirrored network mode.

### Expected Behavior

`hello` can be sent and is received on the other end.

### Actual Behavior

Connection dies with `Ncat: Connection reset by peer.` and `hello` is not received on the other end.

### Diagnostic Logs

Networking logs:
[WslNetworkingLogs-2025-11-17_12-54-48.zip](https://github.com/user-attachments/files/23581844/WslNetworkingLogs-2025-11-17_12-54-48.zip)

Packet captures using Wireshark inside WSL2 on `loopback0`:
* Port 33001: Broken `ncat` without `--keep-open` on WSL2
* Port 33002: Working `ncat` with `--keep-open` on WSL2
* Port 33003: Working `ncat` without `--keep-open` on WSL1
* Port 33004: Working `nc` on WSL2
[ncat_tests2.zip](https://github.com/user-attachments/files/23581853/ncat_tests2.zip)

Begin by reproducing the two-terminal ncat case on WSL2 with mirrored networking, then compare it with --keep-open, WSL1, and nc using the attached networking logs and packet captures. Done means the listener accepts and delivers “hello” without --keep-open and without a connection reset.

Written by the indexing model from the issue text.