Me (who was playing on windows 10) and a friend (who was playing on Xbox) were on a free trial realm when all of a sudden we were both kicked from the realm and it had reset to the last save point, I am the owner of the realm and I didn't do anything that should have caused it. It wasn't showing an error message or anything it just sent me back to the main screen.
Related issues
Comments

Thank you for your report!
We're tracking this issue under MCPE-12347 so I've requested this report be resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
Please don't forget to use the search feature before submitting a bug to see if it has already been reported. The less time we spend linking duplicates means more time testing and confirming the bugs.
Quick Links:
📓 Issue Guidelines – 💬 Community Support Discord – 📧 Mojang Customer Support – 📖 Game Wiki