fix chunk glitch

common/src/main/java/common/world/BlockArray.java

@@ -8,15 +8,19 @@ import common.init.Blocks;
 import common.util.NibbleArray;
 
 public class BlockArray {
-	private int yBase;
+	private final int yBase;
+	private final State filler;
+	
 	private int blocks;
 	private int ticked;
+	private int filled;
 	private char[] data;
 	private NibbleArray blocklight;
 	private NibbleArray skylight;
 
 	public BlockArray(int y, boolean sky, State filler) {
 		this.yBase = y;
+		this.filler = filler;
 		this.data = new char[4096];
 		this.blocklight = new NibbleArray();
 		if(sky)
@@ -47,6 +51,10 @@ public class BlockArray {
 			if(block.getTickRandomly())
 				++this.ticked;
 		}
+		if(ostate == this.filler)
+			++this.filled;
+		if(state == this.filler)
+			--this.filled;
 		this.data[y << 8 | z << 4 | x] = (char)BlockRegistry.getId(state);
 	}
 
@@ -54,6 +62,10 @@ public class BlockArray {
 		return this.get(x, y, z).getBlock();
 	}
 
+	public boolean hasData() {
+		return this.filler != null ? (this.filled > 0) : (this.blocks > 0);
+	}
+
 	public boolean isEmpty() {
 		return this.blocks == 0;
 	}
@@ -85,15 +97,19 @@ public class BlockArray {
 	public void update() {
 		this.blocks = 0;
 		this.ticked = 0;
+		this.filled = 0;
 		for(int i = 0; i < 16; ++i) {
 			for(int j = 0; j < 16; ++j) {
 				for(int k = 0; k < 16; ++k) {
-					Block block = this.getBlock(i, j, k);
+					State state = this.get(i, j, k);
+					Block block = state.getBlock();
 					if(block != Blocks.air) {
 						++this.blocks;
 						if(block.getTickRandomly())
 							++this.ticked;
 					}
+					if(this.filler != null && state != this.filler)
+						++this.filled;
 				}
 			}
 		}