It's default AEM behavior.To AEM it does not care what all steps you
have created inside workflow. If a page is in workflow, irrespective of
in which step that page is, it will show default workflow icon. if this
is too necessary, you might need to customize siteadmin for this
workflow which could be a time consuming task.Can you please elaborate,
when ootb activate later is available, then why you would like to embed
this feature in a custom workflow. ?