The item granter, when “Drop Items at Player Location” is set to “If Inventory Full”, ignores stackable items. For example, you have 3 equipment slots, 2 of them have weapons and 1 has a bandage. If you try to grant another bandage to the player it will drop on the ground, even though you can immediately pick the bandage up and it will stack with your current bandage.
The workaround is to set “Drop Items at Player Location” to “Never”, however this conflicts with systems that rely on the Item Granter to always produce an item. This means that the bandage will stack when its set to Never, but if the bandage stack size is at max, the granted bandage will disappear into the void rather than drop on the ground as would be expected if set to “If Inventory Full”.