Hi.

I found such issue:

I defined global environment variable 

Then I defined environment variable for my master node

I have such pipeline script

And an output for the script is 

In description for node env variables we have such message "Environment variables defined here will be made available to every build executed by this agent, and will override any environment variables that have the same Name as those defined on the Configure System page. "

So it has to override a global value.

I this this issue is somehow connected with these changes

https://github.com/jenkinsci/workflow-job-plugin/pull/43

Thank you.