yeah same for me I get this error. Something to do with collecting user roles in a PDF.
Fatal error: Uncaught Error: implode(): Argument #1 ($pieces) must be of type array, string given
in public_html/wp-content/plugins/woocommerce-jetpack/includes/shortcodes/class-wcj-orders-shortcodes.php on line 561
Call stack:
implode()
wp-content/plugins/woocommerce-jetpack/includes/shortcodes/class-wcj-orders-shortcodes.php:561
WCJ_Orders_Shortcodes::wcj_order_customer_user_roles()
wp-content/plugins/woocommerce-jetpack/includes/classes/class-wcj-shortcodes.php:321
WCJ_Shortcodes::wcj_shortcode()
wp-includes/shortcodes.php:355
do_shortcode_tag()
preg_replace_callback()
wp-includes/shortcodes.php:227
do_shortcode()
wp-content/plugins/woocommerce-jetpack/includes/classes/class-wcj-pdf-invoice.php:240
WCJ_PDF_Invoice::get_html()
wp-content/plugins/woocommerce-jetpack/includes/classes/class-wcj-pdf-invoice.php:261
WCJ_PDF_Invoice::get_pdf()
wp-content/plugins/woocommerce-jetpack/includes/class-wcj-pdf-invoicing.php:306
WCJ_PDF_Invoicing::merge_pdfs()
wp-content/plugins/woocommerce-jetpack/includes/class-wcj-pdf-invoicing.php:267
WCJ_PDF_Invoicing::bulk_actions_handle()
wp-includes/class-wp-hook.php:308
WP_Hook::apply_filters()
wp-includes/plugin.php:205
apply_filters()
wp-admin/edit.php:222