Weighted Pressure Plates fail to recognize stacks as multiple items

weighted pressure plates no longer recognize a stack of say... Dirt, as 64 items- each stackable item will combine and give the same output as if only one block in the stack was there.

only unique or unstackable items contribute to signal the signal strength of either weighted pressure plate(not including mobs or players)

[note how 11 diffrent items on the heavy plate are equaling the signal strength of 65 items (64 stacked, 1 not) on the light plate]