Woocommerce Breadcrumb are great for customers looking for products in a specifiek product within a categorie, but when using products in multiple categories this is not working very well. If you have a product in categorie X, Y and Z for instance, and you navigate to the product from within the catogory Z, your breadcrumbs probably will display Category X.
This is very confusing for customers and even can result in loss of a sale!

I’ve been looking for a solution and found this page which did it for me.

You need to edit the woocommerce/global/breadcrumb.php, it’s best to make a copy of this file to your (child) theme.

Replace this code:

Original Woocommerce Breadcrumbs code:

elseif ( is_single() && ! is_attachment() ) {
 
if ( get_post_type() == 'product' ) {
 
echo $prepend;
 
if ( $terms = wc_get_product_terms( $post->ID, 'product_cat', array( 'orderby' => 'parent', 'order' => 'DESC' ) ) ) {
 
$main_term = $terms[0];
 
$ancestors = get_ancestors( $main_term->term_id, 'product_cat' );
 
$ancestors = array_reverse( $ancestors );
 
foreach ( $ancestors as $ancestor ) {
$ancestor = get_term( $ancestor, 'product_cat' );
 
if ( ! is_wp_error( $ancestor ) && $ancestor )
echo $before . '<a href="' . get_term_link( $ancestor->slug, 'product_cat' ) . '">' . $ancestor->name . '</a>' . $after . $delimiter;
}
 
echo $before . '<a href="' . get_term_link( $main_term->slug, 'product_cat' ) . '">' . $main_term->name . '</a>' . $after . $delimiter;
 
}
 
echo $before . get_the_title() . $after;

with this code:

Code for generating correct woocommerce breadcrumbs

elseif ( is_single() && ! is_attachment() ) {
 
if ( get_post_type() == 'product' ) {
 
echo $prepend;
 
if ( $terms = get_the_terms( $post->ID, 'product_cat' ) ) {
                
                $referer = wp_get_referer();
                foreach( $terms as $term){
                    $referer_slug = (strpos($referer, $term->slug));
 
                    if(!$referer_slug==false){
                        $category_name = $term->name;
                        $ancestors = get_ancestors( $term->term_id, 'product_cat' );
        $ancestors = array_reverse( $ancestors );
                        
                        foreach ( $ancestors as $ancestor ) {
       $ancestor = get_term( $ancestor, 'product_cat' );
 
                            if ( ! is_wp_error( $ancestor ) && $ancestor )
                                echo $before . '' . $ancestor->name . '' . $after . $delimiter;
                        }
                        echo $before . '' . $category_name . '' . $after . $delimiter;
                    }
                }
}
 
echo $before . get_the_title() . $after;