For one the first, and that is that the devs are already awayre of it, but they are working on it 😉
So the problem is when their home gets demolished for and upgrade or you. And so since the game can’t handle “homeless” people they chose to simply delete them from the world.
I suggested them to just find a way to keep them as a paying passenger even thought they dissappeared so even thought  their body is gone their payment will happen at the end 😉