I can confirm what d4spanish wrote above.
WooCoomerce 4.0.1 with Autocomplete 1.3.1 does not work, the orders are suspended.
WooCommerce 4.0.1 with Autocomplete 1.1.0 does work and the orders are completed automatically even with bank transfer option.
Please let me know if I can help debug it somehow. For now, Ill stick to 1.1.0 on the production site.
