Tile map draw order ignored sprite pivot setting

I believed the draw order calc ignored sprite pivot setting, and all defaultly using "center"

the taller one is using customed pivot at(0.5, 0.25), and the short one is centered, so they have the same position y in scene.


but, apparently, they have different render order, the chair/desk covered the taller guy , but not the shorter guy.
It's proved in Frame Debuger:


I don't know if it's a bug or I massed up something.

This is my project on github:
https://github.com/zephyr1125/University.git
You may reproduce it and hope someone help me please.

 

Hello~ anyone home?