tag__in does not return posts

Re: my comment, I am assuming ‘item_tags’ are a custom taxonomy. tag__in only works for WP Core’s Tag taxonomy. Replace your tag__in line with the following:

'tax_query' => array(
    array(
        'taxonomy' => 'item_tags',
        'field' => 'id',
        'terms' => $tag_ids
        )
    )

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