Hangs when redirecting stdin from NUL

"OpenSSH for Windows" version
((Get-Item (Get-Command sshd).Source).VersionInfo.FileVersion)

7.7.2.2

Client OperatingSystem

Windows 10.

What is failing

When running the following at a CMD prompt, the program prints an error and hangs indefinitely.

C:/WINDOWS/System32/OpenSSH/ssh.exe -- git@github.com "git-lfs-authenticate org/repo.git upload" <NUL

This causes this version of OpenSSH to hang with Git LFS, since Git LFS redirects standard input from /dev/null (in our case, using Go's standard library). This works fine for Unix versions of OpenSSH (and is in fact essential for scripting), so there's no reason it shouldn't also work fine for the Windows version.

Using the version of OpenSSH provided by Git for Windows works correctly.

See git-lfs/git-lfs#3779 for more details.

Expected output
The output from the remote side:

Repository not found

Actual output

GetConsoleMode on STD_INPUT_HANDLE failed with 6

Reproduce the issue from a Windows CMD prompt using ssh.exe with stdin redirected from NUL, and inspect the reported GetConsoleMode failure. Confirm the behavior against the Git for Windows version and trace the OpenSSH Windows input-handling entry point; done means the command no longer hangs and returns the remote-side output.