Caching Flutter/iOS dependencies

I declared those actions to cache dependencies for a Flutter app targeting iOS:

      - name: Cache dependencies
        uses: actions/cache@v3
        with:
          path: |
            ${{ env.FLUTTER_ROOT }}/.pub-cache
            **/.packages
            **/.flutter-plugins
            **/.flutter-plugin-dependencies
            **/.dart_tool/package_config.json
          key: build-pubspec-${{ hashFiles('**/pubspec.lock') }}
          restore-keys: |
            build-pubspec-

      - name: Cache pods
        uses: actions/cache@v3
        with:
          path: ios/Pods
          key: ${{ runner.os }}-pods-${{ hashFiles('**/Podfile.lock') }}
          restore-keys: |
            ${{ runner.os }}-pods-

Those actions are (seems ?) to be working fine (cache is created, retrieved and restored) but my build action re-download everything every time as if nothing was restored. What I am missing ?

Start with the cache steps in the workflow and compare their paths with the dependency locations used by the Flutter and iOS build. Inspect the cache logs and the contents keyed by pubspec.lock, Podfile.lock, and ios/Pods; done means a restored cache prevents the build from downloading those dependencies again.