[BUG] Favicon not showing after deploying

[nicklbaert]

Action config

      - uses: actions/checkout@v3
      - name: Install dependencies
        run: npm install

      - name: Build & export the NextJS app & copy it into config/hosting
        working-directory: apps/app
        run: |
          npm run build
          npm run export
          cp -R out ../../config/hosting

      - name: Deploy Preview to Firebase Hosting
        id: deploy-preview
        uses: FirebaseExtended/action-hosting-deploy@v0
        with:
          firebaseServiceAccount: '${{ secret }}'
          expires: 5d
          projectId: <project_id>
          entryPoint: ${{ env.WORKING_DIRECTORY }}

Expected behavior

We have a NextJS app with a favicon.ico inside it's public/ directory. When deploying manually using firebase deploy, the favicon shows in the browser as expected. This should also be the case when using this action.

Actual behavior

The preview website after deploying with the above workflow does not have a favicon.

In more detail: The favicon is simply empty. A get request to the favicon's route runs successfully but returns an empty image. This is the response in Postman:

Any help is appreciated.