Netty channelDuplexHandler Write Is Not Called

ChannelDuplexHandler write method should be called when it is the last handler, but in practice it is not.

From ChannelPipeline,

 ChannelPipeline p = ...;
 p.addLast("1", new InboundHandlerA());
 p.addLast("5", new InboundOutboundHandlerX());

the evaluation order of an inbound and a outbound event could be 1,5 and 5 respectively.

So I thought write in the following class should be called when ctx.write() in channelRead is called:

@ChannelHandler.Sharable
@Component
public class InboundOutboundHandlerX extends ChannelDuplexHandler {


    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ctx.write(msg); // I have also tried writeAndFlush(msg)
    }

    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        ctx.write(msg, promise);  
    }

}

Is there a special trick to get the last duplex handler write method called?