You should be able to find the Discovered resource under Manage > Software > Newly discovered...
But it probably won't have the MSI GUID. I'd right-click > Assign type > Software Release and then add the MSI GUID as a Detection Check.
If you look in the Inventory of a PC with the v1.2 software it should show the Software with a column showing a number indicating how it was discovered, there's a KB article listing the discovery sources somewhere but I'm afraid i can't find it at the moment. How the software is discovered is considered proprietary info AFAIK.