Hi Patrick,
Thanks for contacting Syncfusion support.
We can able to reproduce the Syncfusion Scaffolding not visible in Visual Studio 2019 ASP.NET MVC application. But this issue has been reproduced from the Visual Studio 2019 16.9 version alone and the Syncfusion Scaffolding works in Visual Studio 2019 16.8. We logged a bug request on this and checking with the Microsoft team regarding this issue. You can track of it further from the below feedback portal link.
Regards,
Ganesan Rengasamy.