patrol order not cutting off supply

[Silver1974]

According to the published rules, a Naval Patrol around a port should put that port out of supply, for troops and building purposes. Britain has a patrol from this month in Game 27 which should place E22/44 out of supply (presumably Portugal will build a port there this month). Can you verify this is working properly, and that supply has been cut to the port when Portugal builds it?

Makis note: It does not seem to work, patrol order does not cut off the shipyard from supply

http://www.eaw1805.com/play/scenario/1805/game/27/nation/9
http://www.eaw1805.com/play/scenario/1805/game/27/nation/6