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Export does not ignore YAML fields with trailing underscore
According to pandoc documentation, pandoc conversion should ignore YAML header fields when the last character of a field name is an underscore.
Metadata Blocks ... Metadata will be taken from the fields of the YAML object and added to any existing document metadata... Fields with names ending in an underscore will be ignored by pandoc. (They may be given a role by external processors.) ...
However, export from Zettlr with the fields ending in underscore simply reproduces the fields with trailing underscore.