I did some tests and as far as I can tell only one site is sent SSCN ON regardless of the fxp direction.
SCCN is only turned on if it's off and only turned on for the site issuing the PASV command.
Only one site in a site to site transfer can be the one issuing the PASV command.
If there is an issue it would be a complicated one and it would require a copy of the ftp session log showing the problem, as well as details regarding the site settings.
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