In UE5.2, including the latest source version 5.2.1, the problem is still the same
This log also appears cyclically when clicking “Play” and when scrolling the mouse in the “Outline” or when switching between “Expand” and “Collapse”
Simply deleting the files in the ‘C:\Users\AppData\Local\UnrealEngine’ folder should resolve the problem. It worked for me.
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I have the same problem, and I’m waiting for a reasonable solution too. 
For the wanderers, this doesn’t work, it just hides the warning message. A quicker way to achieve the same is to simply right-click on the “eye” icon near the top-left of the “Outliner”, and uncheck “unsaved”.
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Thank you for that, it works perfect 
Thx a lot, it’s fine
That fixed it for me as well, thank you! It was driving me crazy.