Horse Dissapearing when riding too long

Put the summary of the bug you're having here
I was riding at a desert and my horse randomly disappears.

Describe what you thought should happen here
What I thought would happen is that I can check the whole desert and then come back at my little house

What actually happened was my horse randomly disappears!
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. Keep the horse from disappearing!
3. Done