Following Condition:
I created a MSTEST .testrunconfig for our Unittest with a NamingSchema without Variables. So there will be only one Testresult file and the Server is not flooded with these files.
When a build now fails, and the Postbuildaction "Parse trx file" is checked, Hudson will parse the File even if the build failed.

The expected behaviour would be, to mark the build as failed and do not process the trx file, since it's from an older unittestrun.