Does HFSS support dispersive materials at PML boundaries?

When using frequency domain solver with tetrahedral mesh in CST, dispersive materials can not touch the open boundaries. That is, one can not simulate an infinitely long dispersive slab. I was wondering whether it is the same behavior with HFSS if one wants to continue dispersive materials in to PML region.

I would be happy to hear tips&tricks about simulating dispersive materials with CST FD solver.