Files tied to a path schema and historized are a pain to manage because as soon as you update the path schema, every script reading the historical files before that modification as a path schema will fail (unless you specifically decided to not read such column in the path schema).

A feature is available from the data dictionnary > stats page to manually create dummy columns matching the modified path schema on past files that have been broken by the path schema modification so that they can still be read by your scripts.