If in multiplayer using E4MC or Cloudflared (didn't test on a real server) if you get out of other player's render and simulation distance with a horse and return, they won't see you neither the horse, can't hit you either.

Steps to reproduce:

1. Sit on a horse and put a saddle
2. Travel out of other player's render and simulation distance
3. Then return (you can know when to return if you use Xaero's Minimap because it displays whenever that bug happens you freeze in the world map)
4. And they wont see you.

Minecraft Version: 1.20.1
Fabric Version: 0.16.10
Mod Version: 0.2.3