Remove post type from Breadcrumb NavXT breadcrumbs when viewing Tag archives.

remove_post_type_breadcrumb.php

<?php

/**
 * Filter breadcrumbs to remove post archive when viewing Tag archives.
 */
add_action( 'bcn_after_fill', function( $bcn_breadcrumb_trail ){
	// Bail early if not a tag archive.
	if ( ! is_tag() ) {
		return $bcn_breadcrumb_trail;
	}
	// Action needed. Loop over breadcrumb parts.
	foreach ( $bcn_breadcrumb_trail->breadcrumbs as $breadcrumb_key => $breadcrumb ) {
		// If breadcrumb is for target post archive.
		if ( 465 === $breadcrumb->get_id() ) {
			// Remove breadcrumb.
			unset( $bcn_breadcrumb_trail->breadcrumbs[ $breadcrumb_key ] );
		}
	}
    return $bcn_breadcrumb_trail;
});