Flicking destructed mesh ? why

When my glass destructs and totally on the ground it flicking. Why ? (used destructible mesh/Apex destruction plugin. )

how skinny is it?
if it’s really skinny then it might be z fighting. (fighting for the same render order as the ground).
If it’s thicker it will be above the ground not flat level with it.

so what do you mean? Can’t we increase any parameters? No any solutions? and yea its a.bit thin. Not too much