pre_get_posts main_query not displaying after applying tax_query filters

The issue I had with my search was that the select field’s name was the same name as the taxonomy being queried. When I used a different name for the select field my query worked as it should. 

<?php wp_dropdown_categories(array(
    'name' => 'special_day_select', //anything else besides an existing taxonomy name.
    'taxonomy' => 'special_day'
)); ?>

I hope this is useful for someone else out there.

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