Cannot create and run "production" builds

- I'm using the CustomCharacterDemo.js. The apps seems fine and work when we start using `npm run start-babylon`.
- But when i build it with NODE_ENV=production, the class names become, for example, in this case filename_classname.
- i see that the classnames are used throughout whenever a feature is installed, example: Host.AnimationFeature and Host.TextToSpeechFeature.
- When building using "production" the class names are messed up and "AnimationFeature" becomes "AnimationFeature_AnimationFeature" and Host.AnimationFeature.addLayer("something") throws an error
- This is how my webpack config optimizations block looks like
```
optimization: {
minimize: true,
minimizer: [
new TerserPlugin({
terserOptions: {
keep_classnames: true,
},
}),
],
},
```