Unfortunately, modding is seldom simple or quick. I have edited the mod settings to use 1.2.0 or greater, instead of 1.2.x, and pushed the update. But due to Knossos idiosyncrasies, metadata-only updates do not always propagate to end users.
As mjn.mixael said, FSPort can use 1.2 or 1.3 with equal ease, so if you didn't receive the update and if you are comfortable editing the mod.json file, you can do it yourself.
Fortunately, FSPort will be releasing another update once 21.0 is released to take advantage of a new FSO feature. That update should propagate to everyone, and it will include the main hall metadata update.