MapPos pos = building->get_position();
// apr13 2024 - got a crash here where building->get_position() returned bad_map_pos instead of a valid pos, not sure why
//  for now, at least skip any buildings with bad_map_pos
if (pos == bad_map_pos){
  AILogError["util_update_buildings"] << "ERROR - building->get_position() returned bad_map_pos as its position!  skipping this building";
  continue;
}
  MapPos flag_pos = map->move_down_right(building->get_position());
// saw a weird exception where building 'type' was... 10117???  if this keeps happening start dumping building type before it crashes
// again, same deal.  adding debugging
// debugging confirms seeing buildings with weird high invalid types >1024, maybe bitmath explanation??? look at any place in code
//  that 'type' is modified to find out
// I can't find anywhere in the original code that building type is modified... I think this is a bug and it is pointing
//  to a wrong object?? that is worrying
// first time logging enabled, the building with invalid type used to have a flag at same pos, which was attached a building of TypeHut up-left one pos
// second time, was a Hut again
// third time, never seen before, totally invalid map pos.  this is very likely a wrong pointer
// fourth time, just like 1st and 2nd, knight hut
// 5th, knight hut stub road, had a spiderweb road built to it
// 6th, can't tell.  
// bypassing this error for now
if (type > Building::TypeCastle){
  AILogError["util_update_buildings"] << "RECURRING BUG! has a building of invalid type " << type << " at pos " << pos << ", with flag_pos " << flag_pos << "! bypassing error";
  continue;
}
AILogDebug["util_update_buildings"] << "debug has a building of type " << type << " at pos " << pos << ", with flag_pos " << flag_pos;