WSL 2.7.3: /mnt/shared_memory missing → WSLg windows invisible ([WARN:COPY MODE])

Windows build number:

10.0.26200.8457

Your Distribution version:

24.04

Your WSL versions:

WSL-Version: 2.7.3.0 Kernelversion: 6.6.114.1-1 WSLg-Version: 1.0.73 MSRDC-Version: 1.2.6676 Direct3D-Version: 1.611.1-81528511 DXCore-Version: 10.0.26100.1-240331-1435.ge-release Windows-Version: 10.0.26200.8457

Steps to reproduce:

1. Update to WSL 2.7.3
2. Start WSL
3. Run: xeyes
4. Observe:

• taskbar entry appears
• no window is rendered

WSL logs:

stderr.log weston.log

WSL dumps:

No response

Expected behavior:

xeyes GUI window appears and the eyes follow the mouse pointer

Actual behavior:

After updating to WSL 2.7.3, WSLg GUI applications no longer render any windows.

• Applications launch successfully
• Taskbar icons appear
• Window previews show a blank surface
• No actual window is visible
• The window title includes: [WARN:COPY MODE]