The authors field is multiple, which means that S/R processes it author-by-author (as it does all multiples, such as tags). To make this work, you must get all the authors into one string. To do that, use a template.
The S/R looks like:
Mode: regexp
Source field: Template
Template: {authors}
Search for: &.*
Replace with: (leave this box empty)
Destination: (the desired custom column)
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