In good case, taffic goes TG->DUT1->DUT2->TG and TG<-DUT1<-DUT2<-TG.
In bad case, traffic goes TG<>DUT1 and DUT2<>TG.
From trending point of view, this is not a critical bug, as DUTs are still busy with some traffic (similar to what would be a unidirectional test), but they may hit link bandwidth more easily (especially on testbeds with hyperthreading off ans 1c test). But for report, we should ensure the traffic is the same on all testbeds.

The fix is being worked on, although the code [0] is currently intermingled with a workaround to CSIT-1848.

[0] https://gerrit.fd.io/r/c/csit/+/37590/64/resources/libraries/python/DPDK/L3fwdTest.py