fail_level: error (or any level above none) makes the job fail on the suggestion step

[anatox]

What happens

If you set fail_level to anything other than none (error, warning, info, any), the action exits non-zero on the Running shellcheck (suggestion) step even when the main "Running shellcheck" step succeeded. The main step is fine; the suggestion pass breaks the workflow.

How to reproduce

# testdata/test.sh
#!/usr/bin/env bash
echo $1 # Unquoted variables
find . -name *.txt # Unquoted find/grep patterns

- uses: reviewdog/action-shellcheck@v1
  with:
    fail_level: error # any value other than `none` triggers the bug
    level: warning
    filter_mode: nofilter
    reporter: github-pr-review

Expected

Suggestion pass should always succeed (besides internal errors).

Actual output

Action exits with code 1, and the job fails - even though there are no errors reported by shellcheck

::group:: Running shellcheck ...
testdata/test.sh:2:6: info: Double quote to prevent globbing and word splitting. (ShellCheck.SC2086)
testdata/test.sh:3:14: warning: Quote the parameter to -name so the shell won't interpret it. (ShellCheck.SC2061)
testdata/test.sh:3:14: info: Use ./*glob* or -- *glob* so names with dashes won't become options. (ShellCheck.SC2035)
::endgroup::
::group:: Running shellcheck (suggestion) ...
testdata/test.sh:2:-echo $1 # Unquoted variables
testdata/test.sh:2:+echo "$1" # Unquoted variables
reviewdog: found at least one issue with severity greater than or equal to the given level: error
::endgroup::