Minecraft Username:
Jdawger

Brief Description:
When a mob that is on a lead stacks with others not in a lead, the lead disappears from existence

Instructions:
Take a mob on a lead and lead them towards an already existent stack

How many times did you recreate this?:
Only once so far

Result:
The mobs stack, but the lead is straight up missing

Expected Result:
The lead back in my inventory or at least on the ground