Orders Payment not Capture, error on Checkout

[lauramelos]

Describe the bug
On environment with the setting Payment Capture: Authorize and Capture the payment when the order is placed., some payment are authorized but not captured, letting the order on-hold status and returning an error on checkout process for the buyer that looks like as the order wasn't placed at all.

From what I can see in the error logs, the WC()->session->order_awaiting_payment is deleted when the checkout tries to handle the API return.

We also found that it usually happens on German Merchant sites, and with the CheckoutWC plugin that has the removal of the order_awaiting_payment from the session on one of their steps. But we also seen this issue in not matching environments.

To Reproduce
We wasn't able to reproduce, but we are plenty of users reports of the issue

Expected behavior
Gateway should be able to handle checkout and capture founds

Isolating the problem (mark completed items with an [x]):

• I have deactivated other plugins and confirmed this bug occurs when only the extension is active.
• I can reproduce this bug consistently using the steps above.

WordPress Environment

``` Copy and paste the system status report from **WooCommerce > System Status** in WordPress admin. ```

[lauramelos]

reference https://app.clickup.com/t/1gzvbgp

[ChristianAF]

opened on WooCommerce repor woocommerce#134