TModLoader version: v2023.11.3.3
Mod version: v3.1.4.7
Additional loaded mod: HERO's Mod, to teleport to the edge
client.log: https://pastebin.com/raw/bye1TTCD

Steps to reproduce:
1. Generate a new world with the seed "2.4.1.awgbug" (a Journey world) and the "Sorted World" flag enabled.
2. Enter the world.
3. Head to the left edge of the world; the method you use to get there doesn't seem to matter. On my current save it happens shortly after I cross over some threshold when building my hellbridge, and for reproducing the bug I used HERO's Mod to teleport over there.
4. The game should crash at this point with the error in Terraria.WaterfallManager.FindWaterfalls.


I imagine this could happen on the right side of the world, but it doesn't happen on this world. And on my current save it only happens once you get below some arbitrary height while in the left edge, but that's likely just how the world generation shook out in my case. I'm guessing it's waterfalls in the unreachable world edges causing the crash, so if you fix this, could you add some way to patch worlds generated before the fix?

(oh btw, dontdigup + sorted world makes for a surprisingly fresh and interesting experience, I recommend giving it a try)