Jesús A. Álvarez
Assigned
Reported
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It seems to have stopped happening after restarting windows
I've been experiencing this at least since 1.2.5, running locally on Windows 10.
It happens even with a different cartographer whose tier 4 trade has just been unlocked (who only had a tier 1 trade when the first map was traded and explored).
Happens to me on 1.2.5 too, sometimes a horse will go through, but others it will just disappear, along with its armour and saddle.
1.2 seems to have completely fixed these issues for me.
I'm having the same problem on 1.1.5 on Windows 10, with similar hardware (i7-4770k, 16GB RAM, GeForce GTX 780 and Samsung EVO SSD)
Sometimes it freezes for a couple of minutes when going to/from the nether, before even showing the loading screen, and it can also crash immediately when using a portal.
I have this problem too, both in realms and running the world locally.
Examining the save and comparing it with previous backups, the UniqueID of the players has changed, but all the animals still have the old OwnerID, so they now belong to nobody.