Program: 33867
Project: 33867
Buggy source:
/** 
 * @param material
 * @return count of how many tile entities of type mat are on the island at last count. Counts are done when a player placesa tile entity.
 */
public int getTileEntityCount(Material material){
  int result=0;
  for (int x=getMinProtectedX() / 16; x <= (getMinProtectedX() + getProtectionSize() - 1) / 16; x++) {
    for (int z=getMinProtectedZ() / 16; z <= (getMinProtectedZ() + getProtectionSize() - 1) / 16; z++) {
      for (      BlockState holder : world.getChunkAt(x,z).getTileEntities()) {
        if (onIsland(holder.getLocation())) {
          if (holder.getType() == material) {
            result++;
          }
 else           if (material.equals(Material.REDSTONE_COMPARATOR_OFF)) {
            if (holder.getType().equals(Material.REDSTONE_COMPARATOR_ON)) {
              result++;
            }
          }
 else           if (material.equals(Material.FURNACE)) {
            if (holder.getType().equals(Material.BURNING_FURNACE)) {
              result++;
            }
          }
 else           if (material.toString().endsWith("String_Node_Str")) {
            if (holder.getType().toString().endsWith("String_Node_Str")) {
              result++;
            }
          }
 else           if (material.equals(Material.WALL_SIGN) || material.equals(Material.SIGN_POST)) {
            if (holder.getType().equals(Material.WALL_SIGN) || holder.getType().equals(Material.SIGN_POST)) {
              result++;
            }
          }
        }
      }
      for (      Entity holder : world.getChunkAt(x,z).getEntities()) {
        if (holder.getType().toString().equals(material.toString()) && onIsland(holder.getLocation())) {
          result++;
        }
      }
    }
  }
  if (!plugin.isOnePointEight()) {
    result--;
  }
  return result;
}

Fixed version (ground truth):
/** 
 * @param material
 * @return count of how many tile entities of type mat are on the island at last count. Counts are done when a player placesa tile entity.
 */
public int getTileEntityCount(Material material,World world){
  int result=0;
  for (int x=getMinProtectedX() / 16; x <= (getMinProtectedX() + getProtectionSize() - 1) / 16; x++) {
    for (int z=getMinProtectedZ() / 16; z <= (getMinProtectedZ() + getProtectionSize() - 1) / 16; z++) {
      for (      BlockState holder : world.getChunkAt(x,z).getTileEntities()) {
        if (onIsland(holder.getLocation())) {
          if (holder.getType() == material) {
            result++;
          }
 else           if (material.equals(Material.REDSTONE_COMPARATOR_OFF)) {
            if (holder.getType().equals(Material.REDSTONE_COMPARATOR_ON)) {
              result++;
            }
          }
 else           if (material.equals(Material.FURNACE)) {
            if (holder.getType().equals(Material.BURNING_FURNACE)) {
              result++;
            }
          }
 else           if (material.toString().endsWith("String_Node_Str")) {
            if (holder.getType().toString().endsWith("String_Node_Str")) {
              result++;
            }
          }
 else           if (material.equals(Material.WALL_SIGN) || material.equals(Material.SIGN_POST)) {
            if (holder.getType().equals(Material.WALL_SIGN) || holder.getType().equals(Material.SIGN_POST)) {
              result++;
            }
          }
        }
      }
      for (      Entity holder : world.getChunkAt(x,z).getEntities()) {
        if (holder.getType().toString().equals(material.toString()) && onIsland(holder.getLocation())) {
          result++;
        }
      }
    }
  }
  if (!plugin.isOnePointEight()) {
    result--;
  }
  return result;
}