This? (again, please check attachment.)
That depends what that is.
I'm guessing this is what you're referring to (please check the attachment.)
To recreate the issue:
1. Make a world
2. Open/Play the world
3. Save and exit
4. Re-open the world
(Takes a various amount of time or attempts, usually at least 4-5 attempts)
No problem, thank you for your assistance. It's very much appreciated.