When you use the 'customWorkspace' declarative Pipeline option in a docker agent, it is working correctly. (see attached Jenkinsfile.pass log.pass )

The problem I'm encountering is if you also add the 'reuseNode true' option for that docker agent, then the 'customWorkspace' option is no longer obeyed. (see Jenkinsfile.fail log.fail )

What happens is the stage runs in the same workspace as the previous stage (/Users/rkivisto/.jenkins/workspace/pipeline) which was not even run on the same agent (the first stage was run on the Master, the second stage is running in a container)

You can see the error from the "sh 'pwd'" in the second stage, I would have expected both of these to be in '/Users/rkivisto/.jenkins/test', since the first stage was not run in the same agent as the second stage:

diff log.pass log.fail
...
< /Users/rkivisto/.jenkins/test
—
> /Users/rkivisto/.jenkins/workspace/pipeline