In case anyone comes across this later, I solved the problem by leaving for long enough that the whole zone reset, and killing everyone again. The wealth that was supposed to drop the first time did drop the second.

I saw an older post on a similar issue, but I wanted to report that I am also having the problem of being trapped on a ladder. I am in Ivaldi's Forge. I shot down the ladder and jumped to it, but once I'm on the ladder I can't move. I can't go up or down, and I can't just drop. I can only fast travel (and since I only opened the fast travel spot at the bottom of the map, it's a long way to go to get back). I tried twice, and both times it happened the same way.

I've cleared the shipyards. I got the chests in the boat, the tower, and the basement. There's one more remaining, and the map point is to a spot of empty land in front of a house. It looks like I was supposed to loot the treasure off a body, but there's not a body to loot.