"Ignore paths" not working with custom Codecov config file location

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With these lines in our GitHub actions workflow, we report our test coverage to codecov.

      - name: Report test coverage to codecov
        uses: codecov/codecov-action@v4
        with:
          fail_ci_if_error: true
          files: ./coverage/coverage.xml
          token: ${{ secrets.CODECOV_TOKEN }}
          verbose: true
          codecov_yml_path: ./.config/codecov.yml

Note that we're using codecov_yml_path to refer to a custom location of the codecov.yml file inside a .config/ folder. The file is recognized as can be seen in the last GitHub Actions run here:

debug - 2024-06-01 14:01:52,870 -- Loading config from .config/codecov.yml

Inside the .config/codecov.yml file, we specify that the spec/ folder should be ignored entirely by codecov as we don't want our test files themselves to contribute to the coverage statistics.

# Ignore test files themselves in the Codecov report
# see: https://about.codecov.io/blog/should-i-include-test-files-in-code-coverage-calculations/
ignore:
  - "../spec/**/*"
  - "**/*_spec.rb"

However, in the codecov dashboard, we still see the spec/ folder and all of its contents in the code tree.

Some questions

• From the "Ignoring paths" documentation page, it's not clear whether we should use ../spec/**/* or ./spec/**/* when a custom location for the codecov.yml file is set up. Both variants don't seem to work for us. Maybe it's something obvious that I can't see?
• Should the file coverage.xml only contain results that are not ignored by Codecov? Or is Codecov smart enough to filter this according to the ignore key in the codecov.yml file?