acp-quick_add-saved.php

<?php
/**
 * The acp/quick_add/saved action fires after a new item is created using Quick Add.
 */

/**
 * @param int           $id
 * @param AC\ListScreen $list_screen
 *
 * @return void
 */
function acp_quick_add_saved($id, AC\ListScreen $list_screen)
{
    // Place your code here
}

add_action('acp/quick_add/saved', 'acp_quick_add_saved');

/**
 * Add the filtered term to the newly created post (with the use of quick add)
 */
add_action('acp/quick_add/saved', function ($post_id, AC\ListScreen $list_screen) {
    $event_post_type = 'my_post_type';
    $event_taxonomy = 'my_taxaonomy';

    if ($event_post_type !== $list_screen->get_key()) {
        return;
    }

    // Filter request variables
    $request = new AC\Request();
    $rules = $request->get_query()->get('ac-rules');

    if ( ! $rules) {
        return;
    }

    // Contains the applied smart filters and associated column
    $rules = json_decode($rules)->rules;

    foreach ($rules as $rule) {
        // Get the associated column
        $column = $list_screen->get_column_by_name($rule->id);

        // Check if the rule (with the use of the associated column) is a taxonomy
        if ($column && $event_taxonomy === $column->get_taxonomy()) {
            // Write filtered term to post
            wp_set_post_terms($post_id, (int)$rule->value, $event_taxonomy, true);
        }
    }
}, 10, 2);