Fixed block break particles and sound being played two times for the breaker

src/main/java/net/minestom/server/instance/InstanceContainer.java

@@ -20,6 +20,7 @@ import net.minestom.server.network.packet.server.play.EffectPacket;
 import net.minestom.server.network.packet.server.play.UnloadChunkPacket;
 import net.minestom.server.storage.StorageLocation;
 import net.minestom.server.utils.BlockPosition;
+import net.minestom.server.utils.PacketUtils;
 import net.minestom.server.utils.Position;
 import net.minestom.server.utils.block.CustomBlockUtils;
 import net.minestom.server.utils.callback.OptionalCallback;
@@ -398,7 +399,14 @@ public class InstanceContainer extends Instance {
                 effectPacket.data = blockStateId;
                 effectPacket.disableRelativeVolume = false;
 
-                chunk.sendPacketToViewers(effectPacket);
+                PacketUtils.sendGroupedPacket(chunk.getViewers(), effectPacket,
+                        (viewer) -> {
+                            // Prevent the block breaker to play the particles and sound two times
+                            if (customBlock == null && viewer.equals(player)) {
+                                return false;
+                            }
+                            return true;
+                        });
             }
 
         }

src/main/java/net/minestom/server/utils/NBTUtils.java

@@ -416,6 +416,7 @@ public final class NBTUtils {
      * @return the value representation of a tag
      * @throws UnsupportedOperationException if the tag type is not supported
      */
+    @NotNull
     public static Object fromNBT(@NotNull NBT nbt) {
         if (nbt instanceof NBTNumber) {
             return ((NBTNumber) nbt).getValue();

src/main/java/net/minestom/server/utils/PacketUtils.java

@@ -11,7 +11,9 @@ import net.minestom.server.network.packet.server.ServerPacketIdentifier;
 import net.minestom.server.network.player.NettyPlayerConnection;
 import net.minestom.server.network.player.PlayerConnection;
 import net.minestom.server.utils.binary.BinaryWriter;
+import net.minestom.server.utils.callback.validator.PlayerValidator;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.Collection;
 import java.util.zip.Deflater;
@@ -36,10 +38,12 @@ public final class PacketUtils {
      * <p>
      * Can drastically improve performance since the packet will not have to be processed as much.
      *
-     * @param players the players to send the packet to
+     * @param players         the players to send the packet to
-     * @param packet  the packet to send to the players
+     * @param packet          the packet to send to the players
+     * @param playerValidator optional callback to check if a specify player of {@code players} should receive the packet
      */
-    public static void sendGroupedPacket(@NotNull Collection<Player> players, @NotNull ServerPacket packet) {
+    public static void sendGroupedPacket(@NotNull Collection<Player> players, @NotNull ServerPacket packet,
+                                         @Nullable PlayerValidator playerValidator) {
         if (players.isEmpty())
             return;
 
@@ -50,6 +54,11 @@ public final class PacketUtils {
 
             // Send packet to all players
             for (Player player : players) {
+
+                // Verify if the player should receive the packet
+                if (playerValidator != null && !playerValidator.isValid(player))
+                    continue;
+
                 final PlayerConnection playerConnection = player.getPlayerConnection();
                 if (playerConnection instanceof NettyPlayerConnection) {
                     final NettyPlayerConnection nettyPlayerConnection = (NettyPlayerConnection) playerConnection;
@@ -61,6 +70,16 @@ public final class PacketUtils {
         }
     }
 
+    /**
+     * Same as {@link #sendGroupedPacket(Collection, ServerPacket, PlayerValidator)}
+     * but with the player validator sets to null.
+     *
+     * @see #sendGroupedPacket(Collection, ServerPacket, PlayerValidator)
+     */
+    public static void sendGroupedPacket(@NotNull Collection<Player> players, @NotNull ServerPacket packet) {
+        sendGroupedPacket(players, packet, null);
+    }
+
     /**
      * Writes a {@link ServerPacket} into a {@link ByteBuf}.
      *