Im having similar issues here but only when its xrefs that are more than 2 levels deep. meaning we have skid piping xrefed into a skid model, then the skid model xrefed into an overall model where we would drop isos from. its basically 2 levels deep. the continuations show up when we drop isos from the base piping skid model or the overall skid model that has the piping base model xrefed in, but the master that xrefs the overall skid model the continuations wont populate.