Preconditions (*)

1. Magento 2.3.5-p1
2. php 7.2

Steps to reproduce (*)

1. create a configurable product with a numeric sku ending in a "." example 12345.
2. proceed through with a purchase of the product.

Expected result (*)

1. purchase completes successfully and creates reservations for the order

Actual result (*)

1. Order places into the back end successfully and payment method charges customer
2. afterPlace function throws an exception of Undefined index: 101550. /vendor/magento/module-inventory-sales/Plugin/Sales/OrderManagement/AppendReservationsAfterOrderPlacementPlugin.php on line 132

This is something of a major issue for us, we have had several customers now go through and attempt to place the order 4+ times as the checkout displays an error saying the order could not be processed - however as the actual error is on the "afterPlace" function, the order has been placed and the customer charged. Resulting in the duplicated orders having to be refunded.

Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.