"post" section at the "stage" level executes based on "global" pipeline status and not a stage "status".

The code below (in pastebin) prints "Unstable" 3 times. 

But according to the documentation "These condition blocks allow the execution of steps inside each condition depending on the completion status of the Pipeline or stage."

As I understand "post" at every stage should be independent and not related to "global" pipeline status .