By specifying a theme_location argument in my array, the issue was fixed:
wp_nav_menu(array(
'theme_location' => 'main_menu'
));
Edit
For a distributed Theme, do not pass the 'menu' parameter to the wp_nav_menu() call. It will look for a specific slug of a user-created menu, and will override 'theme_location'. Only ever pass 'theme_location'.
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