Ad inserted into quote

Just wanting to note that I appear to have resolved this by updating the function in the section adunit_topic_betweenposts to:

function bbp_sau_filter_betweenposts($content, $reply_id) {
    global $bbp_sau_opt_vals, $bbp_sau_runonce;
    $location = 'adunit_topic_betweenposts';

    if ($bbp_sau_runonce == 1) {
        return $content;
    } else {
        $bbp_sau_runonce = 1;
    }

    // Check if we're generating content for the WYSIWYG editor
    if (defined('DOING_AJAX') && DOING_AJAX) {
        return $content; // We are in the editor, don't modify the content.
    }

    // Check if the content contains the specific class 'bbp-form'
    if (strpos($content, 'class="bbp-form"') !== false) {
        // If the class is found, return the original content without modification
        return $content;
    }

    if (sau_is_hidden($location)) {
        return $content;
    }

    // Retrieve the ad code based on your settings
    $ad = isset($bbp_sau_opt_vals['positions'][$location]['ad_code']) ? $bbp_sau_opt_vals['positions'][$location]['ad_code'] : '';

    // If ad code is available, proceed with inserting the ad content
    if (!empty($ad)) {
        // MANIPULATE POST OUTPUT
        $content = $content . '</div></div>  <!-- .bbp-reply -->
            <div class="bbp-reply-header">
                <div class="bbp-admin-links">
                </div><!-- .bbp-meta -->
            </div><!-- .bbp-reply-header -->
            <div style="text-align:center;padding-top:20px">
                <!-- .bbp-adunit -->' . stripslashes($ad) . '<!-- .bbp-adunit-end -->
            </div>
            <div><div>';
    }

    return $content;
}

// Add the filter
add_filter('bbp_get_reply_content', 'bbp_sau_filter_betweenposts', 100, 2);