With the release of Windows 10 19H2, Microsoft made a change to the mechanism used for Windows 10 version reporting.
Current generation BAPCo products have been updated (SYSmark 2018 fix will be included in the upcoming patch 3) to report the OS version correctly. However, customers with down-level versions of BAPCo benchmarks may find that in some cases, Windows 10 19H2 will be reported as Windows 10 19H1.
BAPCo encourages customers to always update to the latest patch for their product. Please see the product page on the BAPCo website for the latest updates for your benchmark product.