немного привёл код в порядок

protocol/src/main/java/mc/protocol/io/codec/ProtocolDecoder.java

@@ -52,6 +52,7 @@ public class ProtocolDecoder extends ByteToMessageDecoder {
 		} else {
 			ClientSidePacket packet = packetClass.getDeclaredConstructor().newInstance();
 			packet.readSelf(netByteBuf);
+			log.debug("IN: {}:{}", state, packet);
 			out.add(packet);
 		}
 	}

protocol/src/main/java/mc/protocol/io/codec/ProtocolEncoder.java

@@ -20,7 +20,7 @@ public class ProtocolEncoder extends MessageToByteEncoder<ServerSidePacket> {
 		State state = ctx.channel().attr(NetworkAttributes.STATE).get();
 		int packetId = Objects.requireNonNull(state.getServerSidePacketId(packet.getClass()));
 
-		log.info("Send {}:{}", state, packet);
+		log.debug("OUT: {}:{}", state, packet);
 
 		NetByteBuf buffer = new NetByteBuf(Unpooled.buffer());
 		buffer.writeVarInt(packetId);