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The different lines of custom_columns_settings are executed sequentially, with site section add_to_custom_columns_settings lines being appended to the default setting.
So a 'n'(new) mode line in defaults does nothing on update, and the 'a'(add) mode line in site section still execute.
Which I admit may be a bit unintuitive. It makes more sense for the default 'r'(replace) mode.
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