its a bug. already fixed in one of our branches but will be integrated into the main in the next several days
I am running into the same issue using FlexUnit 4.0. What version of FlexUnit contains this fix?
It is fixed in the code base on github and available in the FlexUnit 4.1 Beta 2 and upcoming Beta 3 release.
The first release version where it will be fixed is 4.1