Same issue in any sort of sea-rider hideout
I tried at different times, different hideouts and even with and without missions, it just doesn't load them.
Also, the villager gave me an error when I got the mission to destroy the hideout and went back to him without doing anything. I didn't take a screenshot but for what I can remember he said something related to a lack of script. When I tried to get the same message it wouldn't work.