stage("Reachable stage") {
    if (some condition)
        return; // Skip all subsequent stages. This appears to cause the problem.
}
stage("Potentially failing or unreachable stage") {
    try
    {
        // This might fail and abort consequent stages.
    }
    finally
    {   // We still want all tests and artifacts that we can get, but we only care for artifacts whose unit tests were executed.
        xunit testTimeMargin: '2000', thresholdMode: 1, thresholds: [skipped(failureNewThreshold: '0', failureThreshold: '0', unstableNewThreshold: '0', unstableThreshold: '0'), failed(failureNewThreshold: '0', failureThreshold: '0', unstableNewThreshold: '0', unstableThreshold: '0')], tools: [xUnitDotNet(deleteOutputFiles: true, failIfNotNew: false, pattern: 'unittests.xml', skipNoTestFiles: false, stopProcessingIfError: true)]
        archiveArtifacts artifacts: '...', defaultExcludes: false
        xunit testTimeMargin: '2000', thresholdMode: 1, thresholds: [skipped(failureNewThreshold: '0', failureThreshold: '0', unstableNewThreshold: '0', unstableThreshold: '0'), failed(failureNewThreshold: '0', failureThreshold: '0', unstableNewThreshold: '0', unstableThreshold: '0')], tools: [xUnitDotNet(deleteOutputFiles: true, failIfNotNew: false, pattern: 'boxtests.xml', skipNoTestFiles: false, stopProcessingIfError: true)]
    }
}
stage("Potentially unreachable stage") {
}