Project cant package with Nativize on and Widgets as value in TMap

When packaging with nativization if you have a widget as a value in a TMap, the package will not finish building. The TMap will throw an error during the Package process that reads:

UnrealBuildTool: D:/Answerhub_repro_proj/DetatchComp/Intermediate/Plugins/WindowsNoEditor/NativizedAssets/Source/NativizedAssets/Public/Widget1__pf1010915279.h(19) : Error: Unrecognized type 'UWidget2_C' - type must be a UCLASS, USTRUCT or UENUM

I believe that this is a bug as Subwidget is a child of UserWidget, which is a UClass.

1. Create a new project (no template or starter content needed)
2. Create a new widget > Name it "SubWidget" > Open SubWidget
3. Add a button to the canvas panel and set the anchor to full screen and set all offsets to 0
4. Compile, Save, and close SubWidget
5. Create a new widget > Name it "MainWidget" > Open MainWidget
6. Add an image to the canvas panel > check the is variable option for the canvas panel
7. In MainWidget's event graph Copy the Blueprint from Win7_MainBP_1
8. Compile, Save, and Close MainWidget
9. In the level blueprint create MainWidget and add it to the viewport
10. Save the Level as "TEST"
11. Open the project settings under Maps & Modes, set the startup and game default maps to TEST
12. In Packaging under Blueprints, set the nativization method to inclusive
13. Package the project for Windows 64 bit

Result: The Package does not build
Expected Result: The Package builds