Why is it that when more than one mushroom or collectable item appears simulataneously, you can only pick up and dispose of one at a time? I notice that when I try to have a child pick up an item, as soon as I drag a child to another one to pick it up, the first one drops what they are carrying and it disappears.

It is strange that I am able to have a child collect a mushroom and carry it to the food bin while another one picks up a collectable and disposes of it in the research shed. But, not two of the same items at once.

Is this by design?