Stonecutter ignores anything over 64 when shift-clicking

When shift-clicking the output of the stonecutter into an inventory, the stonecutter "eats" the output of anything over 64, potentially causing massive item loss

What I expected to happen was...:
When shift-clicking to receive 81 iron nuggets per iron block,

What actually happened was...:
It used 36 iron blocks (36x81=2916), only giving me a full inventory worth of nuggets (2304 total)

Steps to Reproduce:
1. Have a datapack that gives you more than 64 items per item you input 
2. Shift-click the output