Using multiple blocks from a same file might cause a crash

[HZZcode]

As shown in these screenshots, an error occurs when we have 3 blocks all from p3.mcl. At first i thought it was about name, so i changed

mod p3 p3.mcl

to

mod p3 p3.mcl
mod p31 p3.mcl
mod p32 p3.mcl

but it still occurs. i tried to delete 2 of them then it become normal again. Why does this happen?

[HZZcode]

Fxxk you C++ pointer.