All Entities get deleted when another player’s network gets disconnected

I play on a Xbox one S and my friend plays on a xbox one

I was playing minecraft survival with a friend and then my friend’s network was disconnected 

when my friend tried to join back it said unable to connect to would so I saved and quit and loaded back in then my friend joined back and noticed that the sheep in our automatic sheep farm was gone and all our armour stands was also gone and all the armour on the armour stands luckily I made a backup of the world but it has happened before 

I hope this can be fixed soon thanks in advance