Instrumentation of Kafka Clients: Add a Span or an attribute to the current span

Describe the bug
Really I am not sur if it is a Bug, I am working on instrumentation of Kafka Produce/Receive Message following this article: https://opentelemetry.io/blog/2022/instrument-kafka-clients/
I want to add attribute to the current Span.

Steps to reproduce
I have test two methods to instrument kafka Client:

Interceptors: https://opentelemetry.io/blog/2022/instrument-kafka-clients/#using-the-interceptors
Wrapping: https://opentelemetry.io/blog/2022/instrument-kafka-clients/#wrapping-the-clients

in two cases I use this code add attributes to current Span:

    Span span = Span.current();
    span.setAttribute("messaging.user", "My User");
    producer.send(new ProducerRecord<>(topic, payload));

My objectif is to add attribute to the current Span

This code is working fine when I make REST HTTP Request but not in case of Kafka CLient

What did you expect to see?
The attribute is added to the Span

What did you see instead?
Nothing is added

What version are you using?

org.apache.kafka
kafka-clients
3.5.1


io.opentelemetry.instrumentation
opentelemetry-kafka-clients-2.6
1.21.0-alpha


io.opentelemetry
opentelemetry-exporter-otlp
1.21.0


io.opentelemetry
opentelemetry-sdk-extension-autoconfigure
1.21.0-alpha

Environment
Compiler: JDK 17
OS: MAC OS
Runtime: JDK 17

Start by reproducing the issue with the Kafka interceptor and client-wrapping approaches described in the OpenTelemetry Kafka clients article, using the listed Kafka and OpenTelemetry versions. Inspect how Span.current() behaves around producer.send and determine whether the attribute is expected on the active span; done means a confirmed fix or a documented explanation with a focused reproduction.