First of all, if the blue brick is buried on the foundation or supporting structure of the neighbor's wall, it may destroy the neighbor's building structure and lead to potential safety hazards.
Secondly, if the blue bricks are buried in the land on the neighbor's wall, it may change the use or value of the neighbor's land and cause land disputes.
Therefore, before you bury the blue bricks at the door, you'd better communicate with your neighbors and get their consent. If it is necessary to excavate the neighbor's land or building structure, it should be carried out in accordance with relevant laws and regulations and ensure that it will not cause any loss to the neighbor.