gpg-preset-passphrase and extra agent socket

[xeyrion at gmail.com]

I am trying to set up agent forwarding as per
https://wiki.gnupg.org/AgentForwarding. Everything is generally working,
but the remote gpg is prompting for passphrases
despite gpg-preset-passphrase having been used against local gpg agent.

Forwarding normal socket (instead of extra socket) makes the prompt go
away. Is there a way to preset passphrase for extra socket as well?

If not, what are the implications of forwarding the normal socket? The wiki
page just says "extra socket is more restricted" without going into any
details.

Thank you.
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