Regarding the rendering layer of items on the conveyor belt

[sdgmlj]

If there is only one layer of items on the conveyor belt, it can be obscured by the shadow of other entities. If there are more than one layer of items on the conveyor belt, it will not be obscured by the shadow. Is this reasonable?
The current settings are:
Multi layer item>Shadow>One layer item
I think it should be like this:
Shadow>Items (including multiple layers)

[sdgmlj]

Let me explain with pictures