.NET Core run fails with missing module exception

[jmoerdyk]

I'm submitting a bug report

• Library Version:
  1.0.0-beta.14

Please tell us about your environment:

• Operating System:
  Windows 10

• Node Version:
  10.15.3

• Yarn Version:
  1.13.0

• Browser:
  all

• Language:
  all

• Loader/bundler:
  Webpack

Current behavior:
For the .Net Core platform, the clean-webpack-plugin is now missing, so running the project
with the dotnet run command produces an exception on startup.

Create new project with the following options:
√ Would you like to use the default setup or customize your choices? · Custom App
√ Which bundler would you like to use? · Webpack
√ Which HTTP Protocol do you wish the outputted Webpack bundle to be optimised for? · HTTP/1.1
√ What platform are you targeting? · .NET Core
√ What transpiler would you like to use? · TypeScript
√ How would you like to setup your HTML template? · None
√ What css processor would you like to use? · None
√ Do you want to add PostCSS processing · None
√ Which unit test runner would you like to use? · None
√ Would you like to configure integration testing? · None
√ What is your default code editor? · Visual Studio Code
√ Which features do you want scaffolded into your project? · Navigation App

Run dotnet run

Fails with exception:

Application startup exception: System.AggregateException: One or more errors occurred. (Cannot find module 'clean-webpack-plugin'
Error: Cannot find module 'clean-webpack-plugin'

If I add the "clean-webpack-plugin": "^0.1.19" back to the devDependencies as it was in beta13, the project runs normally.

• What is the expected behavior?

Project runs without error

• What is the motivation / use case for changing the behavior?
  This is a bug, a new project should run out of the box with no modification.