Moving partial item stacks between actors duplicates full stack

[sdJasper]

Set up:

1. Created a character in GCS with several items (Short Spear, Sling, Coins).
2. Created empty actor in Foundry, imported GCS actor
3. Created empty items and dragged items from actor. Adjusted skills, parry, etc as needed.
4. Created new empty "container" actor. Moved items to it. Set items' counts. Set token prototype to link character data.
5. Created NPC actor. Set token prototype to link character data.

Reproduction Steps:

1. Added NPC token to map.
2. Add Container token to map.
3. Double click container token to open character sheet.
4. Drag item to NPC token.
5. Set number of items to move to less than full stack. Even 1 will do.

Results: Container actor's equipment is reduced by the proper amount. NPC actor has the total original amount of items from the stack.

Expected Results: The NPC actor only has the amount set to move.