I don't think you see any AI naval blockades after a reload when you hit end turn which indicates that all naval blockade plans were cancelled. I have a savegame with 10 blockades in progress, and after I hit end turn there are no blockades anywhere on the map. I've tested this with several other savegames with the same result.

BTW, it might be better to continue investigating this issue here because too many people at .com are making non-investigatory posts in that thread. I'm not confident that this savegame issue will be fully investigated by CA, so whatever can be documented as being forgotten by the AI on a reload is worth documenting.