In the JUnit test report the age and failedSince values are sometimes wrong. A newly failed test sometimes gets an age greater than 1 and a failedSince pointing to a build where the test did not fail.
I found out that this always happens to tests whose failed method names are not unique. If there are other failed tests with the same method names in the previous report, the wrong failure seems to be recognized as the predecessor.
In my opinion this could be easily fixed by returning
className + '.' + testName instead of just testName from CaseResult.java#getTransformedTestName