At the moment all pipeline post steps will be displayed in the latest defined stage. For example:

pipeline {
    agent;
    stages {
        stage('first stage') { ... }        
        stage('last stage') { ... }
    }
    post {
        always { echo 'Hello World' }
    }
}

The echo step will be assigned to the "last stage". Would be nice to have a new, "virtual" stage e.g. ("post actions") for all that things.