when you lead an animal and put the lead on a fence, and when you die and respawn in the chunk that was loaded when you died the lead in the fence is invisible
how to reproduce
1 lead an animal at the spawn area
2 turn on cheats and do /kill (but you have to respawn in the same chunk the lead is in before you died 
)
3 observe the invisible lead
- duplicates
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MC-14826 Leads in unloaded chunks break, become invisible or connect to an invisible target far away
- Resolved