This just happened in my realm a few minutes ago.
Pillagers just spawned in the End in my realm too. I set the realm to Peaceful to despawn them, but they remained alive.
This just happened to a player in my bedrock realm.
My bedrock realm is experiencing a similar issue. About 30 minutes ago, my players were unable to log into the realm. When they were able to join a few minutes later, the world had been rolled back 1 hour, which is when the last autosave was.
Realm Info:
-10 person realm
-Opened Sept. 13, 2019
-73 members
-World size: ~1GB (infinite, hard mode)
-The name of my realm is SlowNerd Bedrock Paradise, and my Xbox gamertag is Miney01.
I am having this exact same issue on my realm right now. I am trying to upload the Ultimate Minigames map from the Marketplace, but I keep getting "Failed - An error occurred."