with the latest FE build i finally manage to get the wb to stay in the surface dimension.. happy as i was i went into another dimension and types /wb and everything was default.. since it was a farming dimension i chose to set i the wb there pretty small and pregen it. said and done.. after schedueled restart most of the players couldnt move anymore because the wb had been saved to 0.json.
i just made a copy of that file and named it 14.json (farming dim) and reconfigured the wb for dim. 0
now after restart everything works fine..
so there is defently a bug there :P