diff --git a/Tools/Scripts/MapGenerator.cs b/Tools/Scripts/MapGenerator.cs
index ccbc7fb..40528cb 100644
--- a/Tools/Scripts/MapGenerator.cs
+++ b/Tools/Scripts/MapGenerator.cs
@@ -540,8 +540,13 @@ public partial class MapGenerator : TextureRect
 					float craterDepth = 1.0f - (distToCrater / physicalCraterRadius);
 					// Dialed back to -0.15f as per your excellent instinct!
 					float carveTarget = GetSeaLevel(_tempMap[x, y]) - 0.15f;
-					_heightMapClassify[x, y] = Mathf.Lerp(_heightMapClassify[x, y], carveTarget, craterDepth * 0.9f);
-					_heightMap[x, y] = Mathf.Lerp(_heightMap[x, y], carveTarget, craterDepth * 0.9f);
+					// Read BOTH before writing EITHER: with the curve off the two maps
+					// alias the same array, and a sequential read-modify-write carved
+					// the crater twice (caught by the task-10 continuity oracle).
+					float preClassify = _heightMapClassify[x, y];
+					float preCurved = _heightMap[x, y];
+					_heightMapClassify[x, y] = Mathf.Lerp(preClassify, carveTarget, craterDepth * 0.9f);
+					_heightMap[x, y] = Mathf.Lerp(preCurved, carveTarget, craterDepth * 0.9f);
 				}
 			}
 		}