Warning: unrecognized cop always exits with code 0

[coorasse]

Expected behavior

When a warning Warning: unrecognized cop is raised we expect to exit with status code 1.

Actual behavior

rubocop exits with code 0.

Using rubocop --fail-level=warning or Lint: Severity: warning option has no effect.

Steps to reproduce the problem

mkdir test-rubocop
cd test-rubocop
echo "Syntax/Whatever:\n  Enabled: true" > .rubocop.yml
rubocop
echo $?

0 is printed, 1 should be printed because a warning is raised.

RuboCop version

0.73.0

[Drenmi]

It makes sense that rubocop --fail-level=warning should include this.