if this works – here is the extended Way trying to have that for pagination or “load more” Masonry:

/**
 * ENFOLD MASONRY: Show Sticky Posts first in Blog/Portfolio Masonry only
 * (excludes Masonry Galleries)
 */
function avia_masonry_entries_query_mod($query, $params) {
    // Exit if admin
    if (is_admin()) return $query;
    
    // Exit if this is a Masonry Gallery
    if (isset($params['container_class']) && $params['container_class'] === 'av-masonry-gallery') {
        return $query;
    }
    
    // Exit if post_type is attachment (additional safety check)
    if (isset($query['post_type']) && $query['post_type'] === 'attachment') {
        return $query;
    }
    
    // Exit if no sticky posts exist
    $sticky = get_option('sticky_posts');
    if (empty($sticky)) return $query;
    
    // Get the limit from element settings
    $per_page = isset($query['posts_per_page']) ? $query['posts_per_page'] : 6;
    
    // Fetch all non-sticky posts matching the query
    $args = array(
        'post_type'      => $params['post_type'],
        'post__not_in'   => $sticky,
        'posts_per_page' => -1, 
        'fields'         => 'ids',
        'tax_query'      => !empty($query['tax_query']) ? $query['tax_query'] : array(),
    );
    $other_posts = get_posts($args);
    
    // Merge sticky posts first, then others
    $all_ids = array_merge($sticky, $other_posts);
    
    // Apply the ordered IDs to the query
    $query['post__in'] = wp_parse_id_list($all_ids);
    $query['orderby']  = 'post__in';
    $query['order']    = 'ASC';
    $query['posts_per_page'] = $per_page;
    $query['ignore_sticky_posts'] = true;
    
    return $query;
}
add_filter('avia_masonry_entries_query', 'avia_masonry_entries_query_mod', 10, 2);

EDIT: i changed the code with a check if it is an image masonry – because it should not influence these masonries.

can you test this instead ( and remove your solution temporarly ) :

/**
 * Enfold Masonry Filter: Show sticky posts first, followed by other entries (including CPTs)
 * This filter captures selected post types dynamically from the element settings.
 */
function avia_masonry_entries_query_mod($query, $params) {
    // Prevent the filter from running in the WordPress admin backend
    if (is_admin()) {
        return $query;
    }

    // 1. Get the IDs of all sticky posts
    $sticky = get_option('sticky_posts');
    
    // If no sticky posts exist, return the original query without modifications
    if (empty($sticky)) {
        return $query;
    }

    // 2. Fetch IDs for the remaining posts (including Custom Post Types)
    // We use $params['post_type'] to dynamically support whatever is selected in the Masonry element
    $args = array(
        'post_type'      => $params['post_type'], 
        'post__not_in'   => $sticky,         // Exclude stickies so they aren't duplicated
        'posts_per_page' => -1,              // Fetch all IDs to ensure we have enough for the merge
        'fields'         => 'ids',           // Performance optimization: only fetch IDs
    );

    // If a specific taxonomy/category is selected in the element, apply it to our helper query
    if (!empty($params['taxonomy'])) {
        $args['tax_query'] = array(
            array(
                'taxonomy' => $params['taxonomy'],
                'field'    => 'id',
                'terms'    => explode(',', $params['categories']),
            ),
        );
    }

    $other_posts = get_posts($args);

    // 3. Merge the arrays: Stickies first, then the remaining posts
    $combined_ids = array_merge($sticky, $other_posts);

    // 4. Sanitize the IDs (ensure they are integers)
    $query['post__in'] = wp_parse_id_list($combined_ids);
    
    // 5. Force the Masonry to respect the exact order of our merged array
    $query['orderby'] = 'post__in'; 
    $query['order']   = 'ASC'; 
    
    // Set the final limit of items to display
    $query['posts_per_page'] = 6; 

    // Disable default sticky handling to prevent WP from interfering with our custom order
    $query['ignore_sticky_posts'] = true;

    return $query;
}
add_filter('avia_masonry_entries_query', 'avia_masonry_entries_query_mod', 10, 2);