Same issue here. I have a columns called "Author Inverted" which lists the author name as "firstname lastname", whereas I have everything regitsred as "lastname, firstname" in the library
Here's the formula in the custom column
Code:
{authors:'list_re_group($, ' & ', '.', "(^.*\, .*$)|(^.*$)", "[[$:'re($, '^([^,]+), ([^[]+)', '\2 \1')']]", "[[$]]")'}
Problem is that it beaks the export to my Kobo, now all the authors on the books are now named "TEMPLATE ERROR cannot import name EvalFormatter"