WinGet not listing packages as installed

Brief description of your issue

I have an internal WinGet repository where I have uploaded several of our internal applications that I push out to our internal machines. After pushing out certain installers (mainly installers from SAP), they do not show up in a WinGet export as being installed, even though they are. If I run winget list, it tells me the application is installed. I have matched all parameters of the application from what WinGet shows with the package I am pushing out, but it is still not being detected. This seems to be more of an issue with applications that do not install with a proper GUID. For example, SAP GUI installs with a GUID of "SAPGUI".

Steps to reproduce

Create a custom WinGet package of a problematic installer.
Install the application using WinGet.
Export list of installed packages.

Expected behavior

When an application is installed from WinGet, it should be listed in an export of installed packages.

Actual behavior

When an application is installed from WinGet, it is not being listed in an export of installed packages.

Environment

Windows Package Manager v1.6.2631
Copyright (c) Microsoft Corporation. All rights reserved.

Windows: Windows.Desktop v10.0.19045.3448
System Architecture: X64

Reproduce the report by installing a custom package, then compare the output of winget list with winget export for an installer whose installed identifier is SAPGUI. Start by tracing the list and export handling for installed package identifiers; done means packages installed through WinGet, including those without a conventional GUID, appear in the export.