code: private void markUngroupedEnclosedNodes(InstructionGroup group) {
          while_:
          while (true) {
              for (int i = getIndexOfFirstInsn(group), max = getIndexOfLastInsn(group); i < max; i++) {
                  InstructionGraphNode node = method.getGraphNodes().get(i);
                  if (node.getGroup() == null) {
                      markGroup(node, group);
                      sort(group);
                      continue while_;
                  }
              }
              break;
          }
      }
docs: also capture all group nodes "hidden" behind xLoads