binfmt not working for QEMU - Ubuntu's fault??

[micsthepick]

microsoft/WSL#11946 (comment)

seems to state that commenting a line in /usr/lib/systemd/system/systemd-binfmt.service.d/wsl.conf allows binfmt to work, and it's apparently Ubuntu's fault? If so I'd like to track the issue here, or continue the discussion there.

[ashuntu]

I was able to reproduce the issue and the proposed workaround noted in that comment following their steps. However, doing so seems to break Windows interoperability. For example, code . will no longer work from inside WSL, nor will notepad.exe.

Interestingly, if you apply the workaround (commenting out /usr/lib/systemd/system/systemd-binfmt.service.d/wsl.conf) and restart WSL completely, Ubuntu WSL will work in all cases, including Windows binaries and other architecture Linux binaries. It's only when you restart binfmt with systemctl restart systemd-binfmt that Windows interoperability breaks once again.

Seems to be that there is something during the setup of the instance that allows everything to work, but the same setup is not applied when restarting binfmt manually.