Copper Golem will place stackable items inside a chest in the first available slot instead of stacking them with matching items.

Steps to reproduce the issue
- Put any amount of a stackable item in a copper chest and matching items (<64) in any slot proceeding other slots available on a regular chest in the vicinity of a copper golem;
- The copper golem will attempt to find matching items inside the chests and sort the respective item.

Expected result
- The golem will find matching items inside the regular chests and will stack them in the proper slot(s).

Actual result
- The golem will find matching items inside the regular chests and will place them in the first available slot instead of stacking them in their respective slots or right next to them.

Suggestion: Make it so the golem stacks the items with existing matching ones inside the chest in their respective slots and if the stack is completed, make it so the overflow carries on to the next available slot.

Cheers and honey bottles,
Hyphage