That's b.s.! This is a valid bug. You closed it because I didn't reply with a screenshot quick enough? I've seen this reported at least a dozen other times, all closed. You just don't want to deal with actual issues.
This impacts 1.10 release as well. I have a video demonstrating it.
Why are they invalid? This is intended functionality that doesn't work.
This is not just error logs. It manifests in game with a graphical glitch and more importantly slows down your horse. It also effects Pc.
This is still an issue in 1.9pre3 - here is a video demonstration. https://youtu.be/Foz12cl7oYE
This occurs with all leashes, not just summoned leashes. I is an issue as of latest snapshot February 11, 2016 snapshots.
It is inconsistent, but leashes don't render sometimes on login.
Resolved by updating to Java 8u20
Updating to Java 8 (u20) seems to have fixed this problem.
confirmed in 1.7.2
What I wrote was entirely clear and says nothing about a crash. Why would I waste your time with non-important data?