Jenkins sends wrong build status to stash - jenkins

Question

I am using jenkins with the pipeline plugin, the XUnitBuilder plugin and the stash notifier plugin. I have the problem that it reports the wrong build status. My pipeline:
pipeline {
agent none
stages {
stage('Build') {
steps {
parallel(
failFast: true,
'One': {
node( 'windows' ){
run tests ...
step([$class: 'XUnitBuilder',
thresholds: [
[$class: 'FailedThreshold', failureNewThreshold: '0', failureThreshold: '0', unstableNewThreshold: '0', unstableThreshold: '0']
],
tools: [
[$class: 'CTestType', deleteOutputFiles: true, failIfNotNew: true, pattern: 'Testing/**/Test.xml']
]
])
}
},
'Two': {
node( 'windows' ){
run tests ...
step([$class: 'XUnitBuilder',
thresholds: [
[$class: 'FailedThreshold', failureNewThreshold: '0', failureThreshold: '0', unstableNewThreshold: '0', unstableThreshold: '0']
],
tools: [
[$class: 'CTestType', deleteOutputFiles: true, failIfNotNew: true, pattern: 'Testing/**/Test.xml']
]
])
}
}
)
}
}
}
}
Problem: As soon as 'One' is finished, the XUnitBuilder sets the build result to success which is reported to stash and my pull request can be merged. This is obviously wrong since 'Two' may be not even started.
I need to
* prevent the XUnitPublisher from setting the build result if it is success or
* prevent stash from being notified before the whole pipeline finished
Sure, i could stash the test results and run the XUnitBuilder in a post section but this is getting quite complicated since my pipeline has several stages each with several parallel steps running tests.
Does anyone know hot to fix this?