At my base I have sizeable pig villages, during full moon I like to head to moon base right away to prep for the event since that is where I farm moon rocks. After event I head to my base only to notice a lot of my pigs at base are werepigs. I'm thinking it has to do with being off screen and not around to actually see the pigs actively go inside during dusk
Steps to Reproduce
Go off screen of your pigs during full moon event , after event go back to main area of pigs .
This issue has not been confirmed by a developer yet.