I was also getting these errors in a new level after I chose ‘Save Level As’. What worked for me is deleting ‘GameFeatureData.uasset’ file from Windows Explorer and the newly created level file. After opening the project it showed me GameFeatureData.uasset is missing and gave me option to fix it automatically. It compiled the project from old version control and it started working properly (no more validation errors).
Note: I would suggest to take a backup of whole project to other disk partition so that your efforts will not be wasted if this doesn’t work for you.
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