[1.0.51] Pack Beast is the leader of a "Caravan Visit" (with screenshot)

[TacticalMaster]

I have a trade caravan visiting my outpost but they seem to be taking a very long time. As soon as I checked my base, I only see Garru pack beasts at the front of my gate. But when I inspected them, I suddenly noticed that the "Leader" of that Caravan was the Garru Pack Beasts themselves...

And I still haven't receive a notification that the Caravan Visit has arrived at my outpost even though the Pack Beast "Leader" has already arrived at my gate. Because of this, the event is stuck and I'm unable to receive any further Caravan Visits.

(PS: If I recall, I think I have exited the game for sleep and reloaded the game before I even received the arrival notification.)