Breaks `actions/checkout` when running concurrently with it

I use caching action like this:

      - name: Restore cache
        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # 6.1.0
        with:
          path: &cache-path |
            ~/.cargo/registry
            ~/.cargo/git
          key: &cache-key ${{ runner.os }}-${{ runner.arch }}-cargo-${{ hashFiles('**/Cargo.toml') }}
          restore-keys: |
            ${{ runner.os }}-${{ runner.arch }}-cargo-

And I strongly suspect it breaks actions/checkout when running concurrently with it, despite the fact that I'm not caching anything from working directory that would impact it: https://github.com/actions/checkout/issues/2484

Start with the provided actions/cache/restore workflow and the linked actions/checkout issue #2484. Reproduce the concurrent checkout and cache execution, then determine whether the reported breakage is caused by actions/cache; done means documenting a reliable reproduction and an agreed fix or clear confirmation that the interaction is safe.