Horses leaded at a desert biome in vanilla Multiplayer server, my friend and I were the only ones on the server and we went to the End to fight the Ender Dragon. When we came back, the named, saddled, armored horses were gone as well as the leads on the fence.
Duplicate of MC-14826 and MC-19496, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being closed as duplicate.