I started the castle mission for the Minutemen too early and was not able to complete the mission. After I fought the mirelurks and destroyed every last one of the eggs, I left mid-mission to do other quests. I traveled to Mass Pike Interchange with Preston and another companion and now Preston is stuck at Mass Pike Interchange
Now, when I try to go back, it tells me I must destroy all the egg clusters. Can anyone help me with this? I've already tried leaving the area and waiting a few days, but he's still stuck.