Fixed a bug where small patches of terrain surface would disappear.

● The previous patch attempted to fix the surface disappearance bug, but it ended up breaking the digging system and introduced new, smaller hollow ground holes. This update fixes all of those issues, while also fixing the original bug that caused the surface to disappear.

Note: Already missing terrain surfaces cannot be restored automatically. You will need to manually delete the "DGV" folder in your save file (Save_01/DGV). After launching the game again, the ground will be fully restored to its unexcavated state (if you had an underground base, it will be buried and will need to be dug out again).