In addition, Lothruin revolted and joined Tara; it wasn't an action intentionally undertaken by the lord of Lothruin, but a result of game mechanics.
But the transfer of Menedor was intentional. It is highly likely that the transfer of both regions was intended but not able to be fully executed. However, such can only be confirmed via access to the letters of those involved. In addition, prior orders by this players characters to the lord of Anfalas were made with the intent of transferring regions to Tara to deny them from other realms. Even though that action may not be relevant to this case the intent can be.