Fixed #2671

Sort of fixed. I added an if statement to log and return if a certain condition is met. It is unclear if there will be more generation issues as a result.

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/generator/HybridPlotWorld.java

@@ -314,6 +314,10 @@ public class HybridPlotWorld extends ClassicPlotWorld {
         }
         int pair = MathMan.pair(x, z);
         BaseBlock[] existing = this.G_SCH.computeIfAbsent(pair, k -> new BaseBlock[height]);
+        if (y >= height) {
+            PlotSquared.log("Error adding overlay block. `y > height` ");
+            return;
+        }
         existing[y] = id;
     }
 }