You can craft a stack of non-stackable items using data packs

The bug

If I add a recipe via data packs, that shoud craft a non-stackable item (ex. diamond sword) and I add a count, that is bigger than 1 (ex. 64) I get the amount of items in one stack. This works for any integer.

Attached is a sample data pack for testing (MC-122703.zip). Also see 2018-06-23_23.23.33.png.