If you had a set of points, A, B and C, where A and B were right at the limit of losing contact, and B and C were right at the limit of losing contact. B is located right in the middle between A and C.
A <-> B <-> C
Even though A and C can no longer see point B, you couldn't split the universe near B, because B would certainly notice
PS:
Of course, if there was some sort of a crack in spacetime, B would hardly be in a position to complain to management about it
