The caller of ProcSmapsParser::parse_next, records a mapping iff the returned value is true.

  while (parser.parse_next(info)) {
    printer.print_single_mapping(info);
    summary.add_mapping(info);
  }

However, the current spec of this method return false on reaching the end of the last mapping, i.e. EOF.

// Starts or continues parsing. Returns true on success,
// false on EOF or on error.

Therefore, the final mapping is never recorded.