Minecraft Username:
Grithal

Brief Description:
When the stacked tools breaks when McMMO ability is on duration, the whole stack is broken.

Instructions:
1. Use 2 or more stacked tools to the last 1% of life
2. Use by right-click McMMO ability
3. Use the tool until it breaks before the ability will worn off.
4. The whole stack disappeared

How many times did you recreate this bug?:
3 out of 3

Result:
The whole stack of tools disappears.

Expected Result:
1 tool should be broken, not the whole stack.