Placing items placed on the mouse cursor with /item on a slot in Creative mode duplicates them

Short description of the issue

• When using /item to replace the player.cursor slot while the player is in creative mode the items are duplicated when the stack is placed in the inventory on the server-side.

Steps to reproduce the issue

1. Enter creative mode

   gamemode creative

2. Run the command

   item replace entity @s player.cursor with stone 64

3. Open your inventory

4. Place the stack of items on your cursor into your inventory

Expected result

• One stack of items where you placed them.

Actual result

• Two stacks of items, one where you placed them, and one in the next available slot.