If I may, I have a lot more to add on to this. I recently encountered this, and as everyone else seems to have (unless it's only me), just shrugged it off as kinda funny. But then I began looking more into it and I find it a bit worse than just this. As mentioned, the worlds will lose their names and the dates will be set to 12/31/1969, but alongside that, they seem to all have their default game mode set to survival, the seed is set to 0 and even one of my worlds (the Aquatic Quest map) was corrupted. The rest of the worlds I checked out were alright in most cases, but they do get slightly broken after syncing the worlds, I was checking them out the other night and noticed that one of my super flats created literally the night before had already become a victim of the bug and any chunk that hadn't been loaded I'm previously became a normal, non-super flat world. This doesn't seem too bad of a problem, but it's happened to almost all of my worlds and I really don't want it to happen to my main survival world at this current moment. I'm going to try to add some screenshots I took of my worlds that were affected (I'm new so I really don't know what I'm doing) to show what's happened to them. If this is possible to fix, please do.
Cassidy Denning
If I may, I have a lot more to add on to this. I recently encountered this, and as everyone else seems to have (unless it's only me), just shrugged it off as kinda funny. But then I began looking more into it and I find it a bit worse than just this. As mentioned, the worlds will lose their names and the dates will be set to 12/31/1969, but alongside that, they seem to all have their default game mode set to survival, the seed is set to 0 and even one of my worlds (the Aquatic Quest map) was corrupted. The rest of the worlds I checked out were alright in most cases, but they do get slightly broken after syncing the worlds, I was checking them out the other night and noticed that one of my super flats created literally the night before had already become a victim of the bug and any chunk that hadn't been loaded I'm previously became a normal, non-super flat world. This doesn't seem too bad of a problem, but it's happened to almost all of my worlds and I really don't want it to happen to my main survival world at this current moment. I'm going to try to add some screenshots I took of my worlds that were affected (I'm new so I really don't know what I'm doing) to show what's happened to them. If this is possible to fix, please do.