Support for sntrup761x25519-sha512@openssh.com in 8.9 missing?

[aa-matthias]

"OpenSSH for Windows" version
V8.9.1.0p1-Beta

Server OperatingSystem
Ubuntu 22.04

Client OperatingSystem
Windows 11 Pro

What is failing
Windows 11 Pro Client has V8.9.1.0P1-Beta installed
.ssh/config has KexAlgorithms config option set and is including sntrup761x25519-sha512@openssh.com
trying to connect to a server shows a config failure. ssh-Q kex is not listing sntrup761x25519-sha512@openssh.com

Expected output
Shouldn't sntrup761x25519-sha512@openssh.com be supported starting with OpenSSH 8.9 out of the box? It's working just fine on my 22.04 ubuntu install.

Actual output

[Harvester57]

OpenSSH v9.0 switched to using this key exchange cipher, but it is still not supported by the Windows client (even the latest release: https://github.com/PowerShell/Win32-OpenSSH/releases/tag/v9.1.0.0p1-Beta, even though the changelog explicitely mention it includes upstream v9.0 and v9.1 changes)

[appletalk]

sntrup761x25519-sha512@openssh.com still seems to be missing from the latest v9.2 as well.

[jasperweiss]

It is still missing from v9.8 as well

[lilyanatia]

#2140 (comment)