Workaround
Reloging into the world will fix any invisible entity. If you are on singleplayer, just click the Save and Quit button and load the world again. If you are on server, log out and log in.
The bug
Sometimes, when I get off of my horse, it just disappears, and it has no hitbox. But at the same time, I can still hear it. It isn't named FYI.
How to reproduce
Get a mount
Ride the mount for a long time
Dismount of the mount
→ ❌ The horse disappeared
Videos
https://youtu.be/pjA3eonLqZc
https://youtu.be/svjrgRZGVLQ
Linked issues
is duplicated by 7
Attachments
Comments 82
This happens to me consistently, but only after traveling long distances on the horse (roughly 1,000 blocks.) MC v1.10, Java runtime 1.8.0_66-b18, Windows 10 x64, no Optifine, pure vanilla. I can hear the entity's sound effects as well. Relogging corrects the bug.
Happened to me yesterday, 1.10. Got off horse and it disappeared. Closed MC and reopened game and horse was there.
This issue will be fixed in a future version (1.15), hence this ticket has been closed. There are some issues with the fix in the latest development version (see MC-161313), but I'm sure that that'll be fixed as well.
I have found this same problem. My horse seems to be fine dismounting near where I mounted it, but I found that when trying to dismount in any chunks that are not loaded when first mounting the horse, it disappears like for everyone else. This also happens after visiting an unloaded chunk and returning to a chunk that was loaded when mounting the horse. I hope this helps (although I may be a bit late, it might help if the current solution doesn't work)
An issue raised by me some time ago that contained an "Issue Link" to this is still ongoing, see here (https://bugs.mojang.com/browse/MC-157641)
Happened to me twice - 1.10, Windows 10, Optifine, seed=-7654182711137613304
1) swamp biome - ~3500 blocks from spawn - skeleton horse - XYZ=-3417 56 1267
2) plains biome - ~2000 blocks from spawn - normal horse - XYZ=1011 69 2000
In both cases was near large number of cows - could hear, but not visible, even using x-ray resource pack - reappeared after exiting and reloading world.