Composters delete items visually and deleted signs get placed with hands

Signs get deleted by composters when throwing signs at the composter.
When you try to place signs,it looks like it only has 4 items,but actually has 2 more items(invisible)leading to signs being placed with fists

How to reproduce:
1.Throw signs at composter(make sure to leave some signs)
2.Place signs
3.For example if there were 5 signs,and you threw 2,the 3 signs will be placed normally,while the other 2 will be placed using hands