Recently my friends and I opened up a Realm to cross platform play from a world originally started on my Xbox One. It was working fine at first, but recently it disconnects and kicks from the server without warning, and when you go back into the game all your progress was lost.
We noticed this was also causing mobs that were in the area to disappear when it was reloaded, animals in our farm pens, and villagers, specifically. For the most part this isn't affecting any other console users in our Realm, but mine in specific. 

Through multiple tests we've found that as long as the Xbox isn't connected to the Realm, neither our friends on PC or PS4 are having these issues. However, if I log in, the problem effects everyone currently playing.
This happens even when I try and load in on my own, to the point that it will often kick me from the server after only a couple of seconds online. This has become very frustrating, as currently I'm completely unable to actually play on the Realm that I opened up.