NotBlueprintable User Widgets appear as option for Root Widget

Reproduced 3/3 times, issue also occurs in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed NOT a Regression.

Attempting to select NotBlueprintable Widget results in a pop-up saying that it's not allowed.

1. Create a new Blank Cpp project
2. Create a new CPP UUserWidget class
3. Add NotBlueprintable as a UClass specifier
4. Save & Compile
5.  Right Click in the Content Browser and select User Interface > Widget Blueprint

Actual Result: The NotBlueprintable UserWidget is listed as an option for Root Widget.

Expected Result: NotBlueprintable classes should not appear as options, similar to Pick Parent Class BP window

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