If I run a pipline that contains:

node('some-machine') {
  checkout scm
  sh(script 'env')
}

I expect the checkout scm and the script to be passed the environment variables I defined in the machine configuration (Node properties > Environment variables in http://hostname/jenkins/computer/some-machine/configure), as that is passed to the Git Plugin and non-pipeline jobs. Not having this causes problems on some machines (in my case I can't run git through the pipeline)