Trying to WP_Query a category

You are using WP_Query incorrectly: you need to be calling the have_posts() and the_post() functions as methods of your $query variable:

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

Becomes:

<?php if ( $query->have_posts() ) : while ( $query->have_posts() ) : $query->the_post(); ?>

You should also call wp_reset_postdata(); after the query loop is finished.

Learn more about how to use the WP_Query class at the WordPress Codex.

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