Killing a mob when attached to a fence will drop a lead, but also keep it on the fence at the same time, Creating 2 leads.
Related issues
duplicates
Comments

Killing a mob when attached to a fence will drop a lead, but also keep it on the fence at the same time, Creating 2 leads.
migrated
(Unassigned)
Unconfirmed
Minecraft 1.8-pre3
Retrieved
Only a visual bug. Also, has been reported before.