Every character that hasn't already made it in to Chult can't make it now. When You are supposed to run from KoS on a raptor they load on foot; there are 2 dranias (one cowering and one saddled up); KoS is frozen in place and can be killed and the only way to exit is to travel by sign/teleport or queue for something. I've tried with 3 characters. Multiple times on one. Last toon I abandoned "Dark Tidings" and picked it back up before starting. Always the same
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You can proceed on foot and just walk the path that you would have ridden across on the dinos before. It's annoying but still doable.
As soon as you get up the hill that's across the bridge it will progress the quest.