I can't see my horse

I'm going a little bit with my horse, and when I stop, it disappears. There is no sound. When I leave and step back from the world, I see it again.

What I expected ...:

I'll see the horse and there will be nothing wrong

What actually happened ...:
I didn't see my horse and I had no voice.

Here are the steps to take the necessary steps:
1. I'm going a little bit with my horse

2. I'll get off and I can't see my horse