WSL2: Jumbo frames are not forwarded to mirrored interface on Linux

### Windows Version

Windows version: 10.0.22621.3007

### WSL Version

WSL version: 2.1.0.0

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

- [ ] WSL 2
- [X] WSL 1

### Kernel Version

Ubuntu-22.04

### Distro Version

Ubuntu-22.04

### Other Software

_No response_

### Repro Steps

[wsl2]
networkingMode = mirrored
firewall=true
# localhostforwarding = true

Sending Ethernet packets of size 5000 bytes. I see those on Windows but do not see those on Ubuntu's mirrored interface. I do see packets less than 1500 bytes

### Expected Behavior

Expected behavior is that I do see all the packets on mirrored interface

### Actual Behavior

No packets bigger the 1500 bytes are seen

### Diagnostic Logs

_No response_

The report provides a .wslconfig mirrored-networking setup and a reproducible 5000-byte packet test, but names no source files or tests. Start by reproducing the setup and comparing packets visible on Windows with those visible on Ubuntu's mirrored interface. Done means packets larger than 1500 bytes are forwarded and observable there.

Written by the indexing model from the issue text.