No shellcheck report

While shellcheck is in my $PATH, the extension does not report the errors/warnings.

Example:

# .gitlab-ci.yml
myjob:
  stage: mystage
  script:
    - |
      if [ true ] ; then
        echo "true"
      fi 

which shellcheck
# /snap/bin/shellcheck
shellcheck --version
# ShellCheck - shell script analysis tool
# version: 0.11.0
# license: GNU General Public License, version 3
# website: https://www.shellcheck.net

Extension setting for the folder containing shellcheck: /snap/bin.

The Extension does not log anything in the Ouput vscode tab.