message: Preserve blockInfoStart
diff: @@ -583,7 +583,7 @@ void BP3Deserializer::PostDataRead(
  subStreamBoxInfo.IntersectionBox.second);
  helper::DimsArray blockStart(subStreamBoxInfo.BlockBox.first);
  helper::DimsArray blockCount(subStreamBoxInfo.BlockBox.second);
  - helper::CoreDims memoryStart(blockInfoStart); // don't copy
  + helper::DimsArray memoryStart(blockInfoStart);
  for (size_t d = 0; d < intersectStart.size(); d++)
  {
  // change {intersect,block}Count from [start, end] to {start, count}
  