The original Surface Duo has gotten the May 2022 firmware update. Pushing the latest version of the Android OS on the device to 2022.215.137, the latest firmware improves the in-app camera experience along with the usual security fixes.
Per Microsoft's changelogs, the in-app camera experience in dual-screen modes for applications with dynamic orientation requirements has been improved in this release. There are also the security fixes that come in the Android Security Bulletin, May 2022. Not to forget the typical device stability improvements, too.
This update comes in at around 98MB, and it should show up for you automatically under Settings > System > System Update and Check for update. Do note this update is only for the original Surface Duo. The Surface Duo 2 has yet to get a May 2022 patch. It last was updated back on April 12.