xUnit result is not evaluated correctly - "Test summary contained no changed test results out of x total test"

Summary

In our on-premise GitLab Community Edition 11.4.5 installation, no matter whether our test fails or succeeds, GitLab CI/CD always reports that test results didn't change:

Test_results

Steps to reproduce

Here are two different error log files we generated. One reports a success and the other is reporting a failure:

Test_20181121_160732.rxlog.junit.xml

Test_20181121_162705.rxlog.junit.xml

Example Project

Excerpt from the .gitlab-ci.yml file:

test:ranorex:
  variables:
    CI_DEBUG_TRACE: "true"
  stage: ranorex
  tags:
  - windows
  script:
    - rmdir /s /q C:\Temp\Reports
    - "D:"
    - cd "D:\Documents\Visual Studio-Projekte\Ranorex\xxx-Test\xxx-Test\bin\Release"
    - xxx-Test.exe
  after_script:
    - xcopy C:\Temp\Reports\*.xml C:\Temp\GitLab\builds\884d1827\0\brand\xxx\Reports\
  artifacts:
    when: always
    reports:
      junit: C:\Temp\GitLab\builds\884d1827\0\brand\xxx\Reports\*.xml

What is the current bug behavior?

Changes in test results are not reflected correctly.

What is the expected correct behavior?

Changes in test results should show up correctly.