See the following:

podTemplate(label: 'x', inheritFrom: 'JenkinsDeployer', nodeUsageMode: 'EXCLUSIVE') {
    node('x') {
        echo env.environment
        podTemplate(label: 'y', inheritFrom: 'JenkinsLiveDeployer', nodeUsageMode: 'EXCLUSIVE') {
            node('y') {
                echo env.environment
            }
        }
    }
}

Assuming there are pod templates for a 'JenkinsDeployer' which have a set of environment variables and then a pod template for 'JenkinsLiveDeployer', which has a different set of environment variables, then I would expect to see a different value for each echo statement.

Right now, assuming environment on each pod template are respectively pre-production and and production, the actual result of the code snippet above is:

// node starting
'pre-production'

// node starting
'pre-production'

whereas the expected value should be:

// node starting
'pre-production'

// node starting
'production'

This should be the same behaviour as doing the following but it is *not*:

node('label') {
  echo env.environment
  node('live-label') {
    echo env.environment
  }
}