Error: The given key was not present in the dictionary - occurs when saving a smart query with a new column heading on the output

I'm getting the error "The given key was not present in the dictionary" when editing a smart query that was previously saved. The error appears to happen when I use the column header function to rename certain columns.
We are currently evaluating this issue and will update this article when we have more information.

Environment

 4.0.138, patch 4

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