This (This isn't the town that's doing it, just an example.)
This picture ^, see the bottom screen (Yellow one). The items are there.
While here, they're not. This is what I see when I enter one villager's house in that game (so far it only happens in one villager's house) I can't talk to them or exit their house without the game freezing. But when the villager is outside I can talk to them like normal.
What you experience in your town shouldn't have any affect on the villagers when they go to somebody else's town. I know people on other sites who openly give away hacked villagers and never had a problem, so can't think this would be any different