The problem is distance. I’m using World Origin Rebasing and World Composition, but it only allows the player to move only about 20km in the Z axis before running into precision errors and crashing the game. Also, I’m talking about a playable area of about 8000km across in the X and Y axes.
Maybe I’m doing something wrong with World Origin Rebasing? It should keep moving the world origin to wherever the player pawn is, but apparently, it only does this on a flat plane (X and Y). It doesn’t seem to take the Z axis into account.