query_posts in pre_get_posts removes all body classes - how can I reset or keep them?

Question

I've created a function that searches images for a tag, uses them to create a loop and build an array of their parents' IDs.

Its in a pre_get_posts.

Its all working fine except I'm obviously overwriting the query's settings as the site no longer thinks its a taxonomy or archive page.

So the page title is wrong and more importantly so are the body classes. It's set the default blog body classes "blog app-data index-data home-data".

It should be "archive tax-location_features term-red term-35 app-data index-data archive-data taxonomy-data taxonomy-location_features-data taxonomy-location_features-red-data"

    // likely to need to tweak something here.
    global $wp_query;
    // How can i just edit the posts but leave the rest of the query behind?
    $matched_locations = query_posts($matched_parent_args); // loads right posts but body has wrong classes

    $matched_locations = get_posts($matched_parent_args); // works but don't know how to get them set as the postst to display

    $wp_query->current_feature = $queried_tag_slug; // used and works in loop fpr posts to load right image
    // wp_reset_query(); // this obviously undoes all of the work above but resets the body classes etc.

full function

add_filter('pre_get_posts', __NAMESPACE__ . '\\fd_media_tax_parent_posts');

function fd_media_tax_parent_posts($query, $args = [])
{
if ($query->is_tax('location_features') && $query->is_main_query() && !is_admin()) {

    $queried_tag_slug = $query->queried_object->slug;
    $items_with_features_args = [
        'post_type'   => ['attachment','location' ],
        'posts_per_page' => -1,
        'post_status' => ['inherit', 'publish'],
        'tax_query'   => array(
            array(
                'taxonomy' => 'location_features',
                'field'    => 'slug',
                'terms'    =>  $queried_tag_slug,
            ),
        ),
    ];
     
    $items_with_features = get_posts($items_with_features_args);

    $found_attachments         = [];
    $found_attachments_parents = [];
    foreach ($items_with_features as $item):
        $found_attachments[]         = $item->ID;
       
        if($item->post_parent!==0 && !in_array_r($item->post_parent,$found_attachments_parents)){
             $found_attachments_parents[] = $item->post_parent;
        } 
        if ($item->post_parent !== 0) {}
    endforeach;

    $found_ids = array_merge($found_attachments_parents, $found_attachments);

    $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
    $matched_parent_args = [
        'post_type' => ['location'],
        'post__in'  => $found_attachments_parents,
        'posts_per_page' => 20,
        'paged' => $paged
    ];

    global $wp_query;
    // How can i just edit the posts but leave the rest of the query behind?
    $matched_locations = query_posts($matched_parent_args); // loads right posts but body has wrong classes
    $matched_locations = get_posts($matched_parent_args); // works but don't know how to get them set as the postst to display

    $wp_query->current_feature = $queried_tag_slug; // used and works in loop fpr posts to load right image
    // wp_reset_query(); // this obviously undoes all of the work above but resets the body classes etc.
    // 
} elseif ($query->is_tax('location_type') && $query->is_main_query() && !is_admin()) {
    // print_r($wp_query);
}
return $query;
}

Is there a way I can replace the main queries posts or reset the main query info to what it was before I ran query_posts ?

thanks in advance. D.