In reading through the official release from our PLM team, I see these items:
After upgrade from 9.8 to 9.9, the active ZD could report its own license to FM, and FM can manage the ZD normally (we were seeing double the number of AP licenses on the ZD). The other fix is ER-2050 and it has to do with redirect page fails on 9.9.
Our technical lead moderator is out this afternoon but he can reply back later. I hope this helps.