I tried to search for this but have been very fairly inactive recently so maybe I missed something in the SimNews, but the Belarus Medium Carrier no longer is shown having a Hangar or Docking Bay. The rooms are still present inside the ship but I cannot dock a ship or vehicle. Additionally the Hangar/Docking Bay icon do not appear under the ship description. I apologize if this was covered somewhere, but I came up empty on a forum search.
Yes, it is a known problem. To quote Jesfa in the bugbase:
"It's an issue from when equations were fixed I believe/when turbolasers went awry. THe bay needs to be re-added, and we need the ships to be reupdated."