Breadcrumb display subcategory in parent category page

I’am using Avante theme for my WP website.

All my posts have two categories : Main category and subcategory

◊ The problem is that my “Main Category” page displays subcategory in breadcrumb, it looks like:

Home > Main Category > Subcategory

And should be:

Home > Main Category

◊ The default breadcrumb function is :

function the_breadcrumb() {

    echo '<ul id="breadcrumbs">';
    if (!is_home()) {
        echo '<li><a href="';
        echo home_url();
        echo '">';
        echo 'Home';
        echo '</a></li><li class="separator"> &rsaquo; </li>';
        if (is_category() || is_single()) {
            echo '<li>';
            the_category(' </li><li class="separator"> &rsaquo; </li><li> ');

            //PATCH I ADDED IN ORDER TO PREVENT ALPHABETICAL SORTING THAT ALSO DISPLAY THAT DAMNED SUBCATEGORY
            /*$cats=get_the_category('');
            $cid=array();
            foreach($cats as $cat)  { $cid[]=$cat->cat_ID; }
            $cid=implode(',', $cid);
            $numItems = count($cid);
            $i = 0;

            foreach((get_categories('orderby=id&include='.$cid)) as $category) { // notice orderby
                if($i === $numItems) {
                    echo '<li><a href="'.get_category_link($category->cat_ID).'">'.$category->cat_name.'</a></li>'; // keep a space after </a> as seperator 
                }else{
                    echo '<li><a href="'.get_category_link($category->cat_ID).'">'.$category->cat_name.'</a></li><li class="separator"> &rsaquo; </li>'; // keep a space after </a> as seperator 
                }
                $i++;
            }*/

            if (is_single()) {
                echo '</li><li class="separator"> &rsaquo; </li><li>';
                the_title();
                echo '</li>';
            }
        } elseif (is_page()) {
            if($post->post_parent){
                $anc = get_post_ancestors( $post->ID );

                foreach ( $anc as $ancestor ) {
                    $output = '<li><a href="'.get_permalink($ancestor).'" title="'.get_the_title($ancestor).'">'.get_the_title($ancestor).'</a></li> <li class="separator">/</li>';
                }
                echo $output;
                echo '<strong title="'.$title.'"> '.$title.'</strong>';
            } else {
                echo '<strong> ';
                echo the_title();
                echo '</strong>';
            }
        }
    }
    elseif (is_tag()) {single_tag_title();}
    elseif (is_day()) {echo"<li>Archive for "; the_time('F jS, Y'); echo'</li>';}
    elseif (is_month()) {echo"<li>Archive for "; the_time('F, Y'); echo'</li>';}
    elseif (is_year()) {echo"<li>Archive for "; the_time('Y'); echo'</li>';}
    elseif (is_author()) {echo"<li>Author Archive"; echo'</li>';}
    elseif (isset($_GET['paged']) && !empty($_GET['paged'])) {echo "<li>Blog Archives"; echo'</li>';}
    elseif (is_search()) {echo"<li>Search Results"; echo'</li>';}
    echo '</ul>';
}
if ( ! isset( $content_width ) ) $content_width = 980;
?>

◊ On the Subcategory page, the path is correct :

Home > Main Category > Subcategory

And the path is also correct in post page :

Home > Main Category > Subcategory > Title

◊ What can I do to prevent the subcategory to be displayed in the parent category breadcrumb ?

Thank you in advance

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