callback DoWithBlockEntityAt why not work

[as123456]

function OnPlayerRightClick(Player, BlockX, BlockY, BlockZ, BlockFace, CursorX, CursorY, CursorZ)
  local world=Player:GetWorld()
  world:DoWithBlockEntityAt(BlockX, BlockY, BlockZ,
    function  (a_BlockEntity)
      LOG(a_BlockEntity:GetBlockType())
    end
  )
  LOG("End")
  return false
end

(Edited by xoft to add formatting)