diff --git a/src/world/tiles/tilemap.rs b/src/world/tiles/tilemap.rs
index 52f4e52..092ceff 100644
--- a/src/world/tiles/tilemap.rs
+++ b/src/world/tiles/tilemap.rs
@@ -316,7 +316,11 @@ impl TileMap {
             let idx = ChunkData::pos_to_index(lx, ly, z);
             let word = idx / 32;
             let clear_mask = !(1u32 << (idx % 32));
-            chunk.stand_in_floor[word] &= clear_mask;
+            // Only clear stand_on_floor. Removing a floor tile means the space becomes
+            // air — stand_in_floor should stay true so entities can pass through.
+            // Only stand_on_floor needs clearing: the tile above can no longer stand on
+            // a tile that doesn't exist. Clearing stand_in_floor made dug positions
+            // impassable, causing entities to fall through multiple levels.
             chunk.stand_on_floor[word] &= clear_mask;
             chunk.tile_ids[idx] = 0;
         }