I've started dabbling on the action server, and met a few people. One person asked me if I knew about a "wagon bug solution." Near as I can tell, they say they can't actually enter the game world anymore. When they do, they go to the wagons that normally traverse the mist ways.
My idea of the issue is when the module was updated to remove the old mist camp, the only places they could enter the game world were saved in the old mist camp, and since the tent/arrival area isn't in the module anymore, they wind up in a wagon, trying to take them there.
I'm not 100% sure this is the case, but it's my theory, as there are only two areas to enter the world on the action server from the OOC area. They may not know the forums exist either, which could be why nobody has heard about it, until now.
I've made it to the Keep of the Dyad camp without any hitch. The person I spoke to about it says the problem happens after the server resets, which takes at least three people online to do a reset vote, something that doesn't happen often on the action server, it seems!
e: person I spoke with said they tried as recently as a week ago to go to the mist camp on a new character, and it bugged them. They play on Xbox. So it may be something specific to consoles? Not sure if Devs play the game on console at all to try to duplicate issues, or if they have anyone on the RP server to help try to duplicate issues.
If this is actually what is happening, I imagine the easiest fix would be to add a third portal to the Action Server OOC lounge of "Enter World at Vistani Camp," since Faction base entry doesn't exist.