No coverage reports found for @4, @5 using .NET's Microsoft.Testing.Platform

I'm trying to migrate some .NET test projects to the new Microsoft.Testing.Platform runner instead of the now-old Visual Studio based runner. However, I'm having issues getting the coverage file to be found by codecov after switching.

Here's my workflow file.

- name: Publish
      run: |
          dotnet restore
          dotnet run -c Release --project src/${{ env.project_name }}.Tests/${{ env.project_name }}.Tests.csproj --coverage --coverage-output-format xml --results-directory ./coverage
    - name: Upload coverage reports to Codecov
      uses: codecov/codecov-action@v5
      with:
        token: ${{ secrets.CODECOV_TOKEN }}
        directory: ./coverage # I've also tried 'coverage' as well as not including this property at all.
        verbose: true

Here's the job output:

Publish step

  In process file artifacts produced:
    - /home/runner/work/ars/ars/coverage/1dece2dd-61a2-4761-a929-71b9b28ff08a.xml
Test run summary: Passed! - /home/runner/work/ars/ars/src/Ars.Function.Tests/bin/Release/net9.0/Ars.Function.Tests.dll (net9.0|x64)

Upload coverage reports to Codecov step

Run codecov/codecov-action@v5
Run CC_ACTION_VERSION=$(cat ${GITHUB_ACTION_PATH}/src/version)
==> Running Action version 5.1.2
Run git config --global --add safe.directory /home/runner/work/ars/ars
Run CC_FORK="false"
Run if [ "false" == 'true' ] && [ "$CC_FORK" != 'true' ];
==> Token set from input
Run if [ -z "$CC_BRANCH" ] && [ -z "$CC_TOKEN" ] && [ "$CC_FORK" == 'true' ]
Run if [ -z "$CC_SHA" ];
Run ${GITHUB_ACTION_PATH}/dist/codecov.sh
     _____          _
    / ____|        | |
   | |     ___   __| | ___  ___ _____   __
   | |    / _ \ / _` |/ _ \/ __/ _ \ \ / /
   | |___| (_) | (_| |  __/ (_| (_) \ V /
    \_____\___/ \__,_|\___|\___\___/ \_/
                            Wrapper-0.0.31
                                  
==> Detected linux
 -> Downloading https://cli.codecov.io/latest/linux/codecov
==> Finishing downloading linux:latest
      Version: v9.1.1
 
gpg: directory '/home/runner/.gnupg' created
gpg: keybox '/home/runner/.gnupg/pubring.kbx' created
gpg: /home/runner/.gnupg/trustdb.gpg: trustdb created
gpg: key 806BB28AED779869: public key "Codecov Uploader (Codecov Uploader Verification Key) <security@codecov.io>" imported
gpg: Total number processed: 1
gpg:               imported: 1
==> Verifying GPG signature integrity
 -> Downloading https://cli.codecov.io/latest/linux/codecov.SHA256SUM
 -> Downloading https://cli.codecov.io/latest/linux/codecov.SHA256SUM.sig
 
gpg: Signature made Sat Dec  7 16:07:53 2024 UTC
gpg:                using RSA key 27034E7FDB850E0BBC2C62FF806BB28AED779869
gpg: Good signature from "Codecov Uploader (Codecov Uploader Verification Key) <security@codecov.io>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 2703 4E7F DB85 0E0B BC2C  62FF 806B B28A ED77 9869
codecov: OK
==> CLI integrity verified
 -> Token of length 36 detected
==> Running upload-coverage
      ./codecov --verbose upload-coverage -t <redacted> --git-service github --dir coverage --gcov-executable gcov
info - 2024-12-[30](https://github.com/sendtrucks/ars/actions/runs/12540533840/job/34967933585#step:5:32) 01:38:12,971 -- ci service found: github-actions
debug - 2024-12-30 01:38:12,973 -- versioning system found: <class 'codecov_cli.helpers.versioning_systems.GitVersioningSystem'>
debug - 2024-12-30 01:38:12,974 -- versioning system found: <class 'codecov_cli.helpers.versioning_systems.GitVersioningSystem'>
debug - 2024-12-30 01:38:12,976 -- Loading config from /home/runner/work/ars/ars/.github/codecov.yml
debug - 2024-12-30 01:38:12,979 -- Starting upload coverage --- {"verbose": true, "auto_load_params_from": null, "codecov_yml_path": null, "enterprise_url": null, "version": "cli-9.1.1", "command": "upload-coverage", "git_service": "github", "files_search_root_folder": "coverage", "gcov_executable": "gcov", "commit_sha": "90ffe39a730bcc6204[31](https://github.com/sendtrucks/ars/actions/runs/12540533840/job/34967933585#step:5:33)0d20af0753c9ead27165", "fail_on_error": false, "slug": "sendtrucks/ars", "report_code": "default", "network_root_folder": "/home/runner/work/ars/ars", "files_search_exclude_folders": [], "files_search_explicitly_listed_files": [], "disable_search": false, "disable_file_fixes": false, "build_code": "1254053[38](https://github.com/sendtrucks/ars/actions/runs/12540533840/job/34967933585#step:5:41)40", "build_url": "https://github.com/sendtrucks/ars/actions/runs/12[54](https://github.com/sendtrucks/ars/actions/runs/12540533840/job/34967933585#step:5:58)0533840", "job_code": "Deploy Function App", "name": "12540533840", "branch": "main", "pull_request_number": null, "env_vars": {}, "flags": [], "plugin_names": ["xcode", "gcov", "pycoverage"], "dry_run": false, "use_legacy_uploader": false, "handle_no_reports_found": false, "report_type": "coverage",
debug - 2024-12-30 01:38:12,9[80](https://github.com/sendtrucks/ars/actions/runs/12540533840/job/34967933585#step:5:85) -- Selected preparation plugins --- {"selected_plugins": ["<class 'codecov_cli.plugins.xcode.XcodePlugin'>", "<class 'codecov_cli.plugins.gcov.GcovPlugin'>", "<class 'codecov_cli.plugins.pycoverage.Pycoverage'>"], "cli_config": {}}
debug - 2024-12-30 01:38:12,980 -- Running preparation plugin: <class 'codecov_cli.plugins.xcode.XcodePlugin'>
debug - 2024-12-30 01:38:12,980 -- Running xcode plugin...
warning - 2024-12-30 01:38:12,980 -- xcrun is not installed or can't be found.
debug - 2024-12-30 01:38:12,980 -- Running preparation plugin: <class 'codecov_cli.plugins.gcov.GcovPlugin'>
debug - 2024-12-30 01:38:12,980 -- Running gcov plugin...
warning - 2024-12-30 01:38:12,980 -- No gcov data found.
debug - 2024-12-30 01:38:12,981 -- Running preparation plugin: <class 'codecov_cli.plugins.pycoverage.Pycoverage'>
warning - 2024-12-30 01:38:12,981 -- coverage.py is not installed or can't be found.
debug - 2024-12-30 01:38:12,981 -- Collecting relevant files
info - 2024-12-30 01:38:12,988 -- Found 0 coverage files to report
Error: No coverage reports found. Please make sure you're generating reports successfully.
==> Failed to upload coverage

Any ideas what this could be?