Angular 9 does not use any component styles (IVY disabled)

Question

I am currently trying to get a project running with Angular 9 RC6. Unfortunately it is not able to compile with Angular Ivy, probably because of one of the dependencies. So I have to disable Ivy. It uses Angular Material and all the projects style files are .scss files. Building and serving runs successfully.

But when I serve (or build and serve) the website, none of the component related styles are applied. Although it uses the Angular Material styles properly.

The project was initiated with create-nx-workspace from Nrwl/Nx. In the angular.json file there is the schematic

"projects": {
  "myProject": {
    "projectType": "application",
    "schematics": {
      "@nrwl/angular:component": {
        "style": "scss"
      }
    }
  }
}

And the builder is @angular-devkit/build-angular:browser for building or @angular-devkit/build-angular:dev-server for serving.

Here are my Angular dependencies (after the empty line devDependencies):

"@angular/animations": "~9.0.0-rc.6",
"@angular/cdk": "^9.0.0-rc.5",
"@angular/common": "~9.0.0-rc.6",
"@angular/compiler": "~9.0.0-rc.6",
"@angular/core": "~9.0.0-rc.6",
"@angular/fire": "^5.3.0-rc.2",
"@angular/forms": "~9.0.0-rc.6",
"@angular/material": "^9.0.0-rc.5",
"@angular/platform-browser": "~9.0.0-rc.6",
"@angular/platform-browser-dynamic": "~9.0.0-rc.6",
"@angular/platform-server": "^9.0.0-rc.6",
"@angular/router": "~9.0.0-rc.6",
"@angular/service-worker": "^9.0.0-rc.6",

"@angular-devkit/build-angular": "~0.900.0-rc.6",
"@angular/cli": "~9.0.0-rc.6",
"@angular/compiler-cli": "~9.0.0-rc.6",
"@angular/language-service": "~9.0.0-rc.6",

Do you have any idea how I am able to debug this issue? Please let me know if information is missing.

Cheers and Thanks!