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May or may not be what you are looking for but
Preferences > Tweaks > (search for author sort)
On the left side you will see your results. You might try "Author sort name algorithm" > under edit tweak (bottom center) "author_sort_copy_method" maybe try invert?
The left side option below the above might also be useful "categories_use_field_for_author_name = 'author_sort'"
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