Issues with using @ser to resolve invalid CSV column names

I’ve got some data in a .csv that utilizes column names with invalid chars (whitespaces in names, parentheses, slashes, etc.) that basically can’t be directly turned into fields in a canonical. To work around this, I’ve been creating valid field names for each column and utilizing the @ser annotation to link them back, as advised in: and

@ser(name="Column 1 Name")
Column1Name: string 

Upon provisioning, I get the same issue as [Invalid Value Path … ], except using @ser hasn’t fixed it.

Any ideas why? Running locally on server version

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