Hi I would would like to report a bug that has been happening in my world. There have been multiple occasions where horses, foxes, Iron golems, and fully maxed out villagers (All Named) have despawned.  There were also times where I would have a lead in my hand attached to a mob or I was riding a horse before I get a phone or video call. After I would get back on to minecraft all mobs that I had would not be anywhere in sight, and there would be no horse. I have lost multiple horses, saddles and one iron horse armor from this. Me and my friends are getting frustrated over losing mobs  over and over again and I don't want them to quit playing with me over this. If you could fix this we would really appreciate it. 

Thank you for your time.