diff --git a/build.gradle b/build.gradle
index 20b6b5125..b612cb005 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ plugins {
     id 'java'
     id 'maven-publish'
     id 'net.ltgt.apt' version '0.10'
-    id 'org.jetbrains.kotlin.jvm' version '1.4.21'
+    id 'org.jetbrains.kotlin.jvm' version '1.5.0'
     id 'checkstyle'
 }
 
diff --git a/src/main/java/net/minestom/server/instance/Chunk.java b/src/main/java/net/minestom/server/instance/Chunk.java
index 63a6df454..53987e804 100644
--- a/src/main/java/net/minestom/server/instance/Chunk.java
+++ b/src/main/java/net/minestom/server/instance/Chunk.java
@@ -417,22 +417,18 @@ public abstract class Chunk implements Viewable, Tickable, DataContainer {
         UpdateLightPacket updateLightPacket = new UpdateLightPacket(getIdentifier(), getLastChangeTime());
         updateLightPacket.chunkX = getChunkX();
         updateLightPacket.chunkZ = getChunkZ();
-        updateLightPacket.skyLightMask = 0x3FFF0;
-        updateLightPacket.blockLightMask = 0x3F;
-        updateLightPacket.emptySkyLightMask = 0x0F;
-        updateLightPacket.emptyBlockLightMask = 0x3FFC0;
+        updateLightPacket.skyLightMask          = 0b111111111111111111;
+        updateLightPacket.emptySkyLightMask     = 0b000000000000000000;
+        updateLightPacket.blockLightMask        = 0b000000000000000000;
+        updateLightPacket.emptyBlockLightMask   = 0b111111111111111111;
         byte[] bytes = new byte[2048];
         Arrays.fill(bytes, (byte) 0xFF);
-        List<byte[]> temp = new ArrayList<>(14);
-        List<byte[]> temp2 = new ArrayList<>(6);
-        for (int i = 0; i < 14; ++i) {
+        final List<byte[]> temp = new ArrayList<>(18);
+        for (int i = 0; i < 18; ++i) {
             temp.add(bytes);
         }
-        for (int i = 0; i < 6; ++i) {
-            temp2.add(bytes);
-        }
         updateLightPacket.skyLight = temp;
-        updateLightPacket.blockLight = temp2;
+        updateLightPacket.blockLight = new ArrayList<>(0);
 
         return updateLightPacket;
     }
diff --git a/src/main/java/net/minestom/server/listener/BlockPlacementListener.java b/src/main/java/net/minestom/server/listener/BlockPlacementListener.java
index 413d34a6d..2eab9562a 100644
--- a/src/main/java/net/minestom/server/listener/BlockPlacementListener.java
+++ b/src/main/java/net/minestom/server/listener/BlockPlacementListener.java
@@ -99,13 +99,15 @@ public class BlockPlacementListener {
         blockPosition.add(offsetX, offsetY, offsetZ);
 
         if (!canPlaceBlock) {
-            //Send a block change with AIR as block to keep the client in sync,
-            //using refreshChunk results in the client not being in sync
-            //after rapid invalid block placements
-            BlockChangePacket blockChangePacket = new BlockChangePacket();
-            blockChangePacket.blockPosition = blockPosition;
-            blockChangePacket.blockStateId = Block.AIR.getBlockId();
-            player.getPlayerConnection().sendPacket(blockChangePacket);
+            if (useMaterial.isBlock()) {
+                //Send a block change with AIR as block to keep the client in sync,
+                //using refreshChunk results in the client not being in sync
+                //after rapid invalid block placements
+                BlockChangePacket blockChangePacket = new BlockChangePacket();
+                blockChangePacket.blockPosition = blockPosition;
+                blockChangePacket.blockStateId = Block.AIR.getBlockId();
+                player.getPlayerConnection().sendPacket(blockChangePacket);
+            }
             return;
         }