Search before asking

• I had searched in the issues and found no similar issues.

What happened

• Failure strategy continue does not work for serial tasks. Although the doc doesn't say it could work for serial tasks, it should work for it instead of only for parallel tasks.
• In many scenarios, we need a clean-up task at the end of a workflow. Without failure strategy working as expected, we could never achieve this.
• This bug exists in both 3.0.0-release and dev.
  
  

What you expected to happen

• Failure strategy continue is supposed to work for all kinds of workflows.
• We need to fix the bug and change the docs.

How to reproduce

• Already described above.

Anything else

Version

dev

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct