When manually starting spice-vdagent from gnome-terminal, we get a session_info_session_for_pid() failure. It turns out sd_pid_get_session() is returning an error when spice-vdagent is started from gnome-terminal, as gnome-terminal is spawned by gnome-terminal-server which is running from gnome-terminal-server.service, which apparently prevents getting session info for the process we run from the shell :( Using rxvt avoids the issue for now.
Not sure if it's something we need to fix in spice-vdagent or if it's a more generic issue.
another workaround is to run without the session info integration:
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