I think those were unloaded during the ‘delay’. If they weren’t, I guess the Wikipedia page would have mentioned something about life on the Münsterland, carrying eggs and fruit.
I would assume any perishable cargo was quickly lost to spoilage during the ongoing conflict and the rest of the cargo just staying there. There are actually interesting stories about how the crews of the stack ships got to know each other and how they spent their time during the uncertain time after the channel became impassable - they did theater plays, did sports competitions, fished for food, etc.
Over time as the political situation cleared up a bit most of the crew members were repatriated with just a periodically rotated skeleton crew watching over the ships staying behind.
