My horse disappears every time I jump into deeper water from a high position and then reappears when I run further away or out of sight.

I noticed that the horse is still there, but invisible and useless.

I see the particles in the water and hear the horse, but I can no longer use it.

If I then walk further away as I said and come back again, it will be there again.

The same thing also happened to my friend with his horse.