I followed your example and I still don't have either scripts or content folders in my project. This is the package manager console output:
GET https://www.nuget.org/api/v2/Packages(Id='Syncfusion.EJ2.JavaScript',Version='16.1.0.42')
GET https://nuget.syncfusion.com/nuget_aspnetcore-js2/nuget/getsyncfusionpackages/aspnetcore-js2/Packages(Id='Syncfusion.EJ2.JavaScript',Version='16.1.0.42')
InternalServerError https://nuget.syncfusion.com/nuget_aspnetcore-js2/nuget/getsyncfusionpackages/aspnetcore-js2/Packages(Id='Syncfusion.EJ2.JavaScript',Version='16.1.0.42') 352ms
OK https://www.nuget.org/api/v2/Packages(Id='Syncfusion.EJ2.JavaScript',Version='16.1.0.42') 1049ms
Error finding repository for 'https://nuget.syncfusion.com/nuget_aspnetcore-js2/nuget/getsyncfusionpackages/aspnetcore-js2': An error occurred while retrieving package metadata for 'Syncfusion.EJ2.JavaScript.16.1.0.42' from source 'SyncfusionAspNetCore'.
Failed to fetch results from V2 feed at 'https://nuget.syncfusion.com/nuget_aspnetcore-js2/nuget/getsyncfusionpackages/aspnetcore-js2/Packages(Id='Syncfusion.EJ2.JavaScript',Version='16.1.0.42')' with following message : Response status code does not indicate success: 500 (Internal Server Error).
Response status code does not indicate success: 500 (Internal Server Error).
Restoring packages for C:\Users\JNickVA1\Source\Repos\PerShift\Agency\Agency.csproj...
GET https://www.nuget.org/api/v2/FindPackagesById()?id='Syncfusion.EJ2.JavaScript'&semVerLevel=2.0.0
GET https://nuget.syncfusion.com/nuget_aspnetcore-js2/nuget/getsyncfusionpackages/aspnetcore-js2/FindPackagesById()?id='Syncfusion.EJ2.JavaScript'&semVerLevel=2.0.0
OK https://nuget.syncfusion.com/nuget_aspnetcore-js2/nuget/getsyncfusionpackages/aspnetcore-js2/FindPackagesById()?id='Syncfusion.EJ2.JavaScript'&semVerLevel=2.0.0 687ms
OK https://www.nuget.org/api/v2/FindPackagesById()?id='Syncfusion.EJ2.JavaScript'&semVerLevel=2.0.0 920ms
GET https://www.nuget.org/api/v2/package/Syncfusion.EJ2.JavaScript/16.1.0.42
OK https://www.nuget.org/api/v2/package/Syncfusion.EJ2.JavaScript/16.1.0.42 1649ms
Installing Syncfusion.EJ2.JavaScript 16.1.0.42.
Installing NuGet package Syncfusion.EJ2.JavaScript 16.1.0.42.
Committing restore...
Writing lock file to disk. Path: C:\Users\JNickVA1\Source\Repos\PerShift\Agency\obj\project.assets.json
Restore completed in 9.34 sec for C:\Users\JNickVA1\Source\Repos\PerShift\Agency\Agency.csproj.
Successfully installed 'Syncfusion.EJ2.JavaScript 16.1.0.42' to Agency
Executing nuget actions took 1.25 sec
Time Elapsed: 00:00:12.1253777
========== Finished ==========
Time Elapsed: 00:00:00.0948875
========== Finished ==========