SSH Client fails handshake when using publickey method

I'm building a SSH server using your Node.js library and I'm building the SSH client using the x/crypto/ssh Golang library. The client aborts the SSH handshake when using the publickey authentication method.

I built an example project including server and client here: https://github.com/0x7f/ssh-authentication-bug

Even though the server offers [publickey] authentication methods when initiating the handshake with authentication method none, the client fails to connect. The client uses the publickey method and offers the key, and the server accepts the key, but the client still prints the error:

2024/03/21 09:07:40 Failed to dial: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

I'm trying to figure out whether this is a bug in the server library or the client library. I already posted a bug in the Golang project: https://github.com/golang/go/issues/66438. Either the Node.js server library is doing something non-standard during the handshake, or the client has some issue, or I'm stupid and did something wrong in the code. The OpenSSH client works though.

Let me know when you need more information.

Run the linked ssh-authentication-bug example and compare the Node.js server's publickey exchange with the working OpenSSH case. Read the related golang/go issue and use the handshake results to determine whether ssh2 or the Go client is violating the expected protocol; done means a reproducible cause and an identified compatibility fix or clarification.