Context propagation does not work correctly

[Ryosuke Hasebe]

Expected Behavior

When using webflux client with reactor-netty as the foundation, context propagation is not working correctly within doOnSuccess when I write the following code.
( I am using Hooks.automaticContextPropagation. )

webClient.get().uri("https://example.com").retrieve().toBodilessEntity()
    .doOnSuccess {
        log.info("doOnSuccess. MDC={}, myThreadLocal={}", MDC.getCopyOfContextMap(), myThreadLocal.get())
    }
    .block()

Normally, myThreadLocal always should have a value, but it is null.
e.g.

Request. MDC={traceId=65112e6f3c6d3484b56a985ebe16e3d6, spanId=b56a985ebe16e3d6}, myThreadLocal=887c802d-0e0a-4398-82fc-325584e6e5a5
Response. MDC={traceId=65112e6f3c6d3484b56a985ebe16e3d6, spanId=eac8c2a04a688c53}, myThreadLocal=887c802d-0e0a-4398-82fc-325584e6e5a5
doOnSuccess. MDC={traceId=65112e6f3c6d3484b56a985ebe16e3d6, spanId=eac8c2a04a688c53}, myThreadLocal=null

The complete code is here.
https://github.com/be-hase/context-propagation-report-202309/tree/main/reactor-netty-issue
https://github.com/be-hase/context-propagation-report-202309/blob/main/reactor-netty-issue/src/main/kotlin/example/ReactorNettyIssueApplication.kt

It works with jdkClientHttpConnector, so I expect it is a reactor-netty issue.

Actual Behavior

myThreadLocal always has a value.

Request. MDC={traceId=65112e6f3c6d3484b56a985ebe16e3d6, spanId=b56a985ebe16e3d6}, myThreadLocal=887c802d-0e0a-4398-82fc-325584e6e5a5
Response. MDC={traceId=65112e6f3c6d3484b56a985ebe16e3d6, spanId=eac8c2a04a688c53}, myThreadLocal=887c802d-0e0a-4398-82fc-325584e6e5a5
doOnSuccess. MDC={traceId=65112e6f3c6d3484b56a985ebe16e3d6, spanId=eac8c2a04a688c53}, myThreadLocal=887c802d-0e0a-4398-82fc-325584e6e5a5

Steps to Reproduce

Check out this repo( https://github.com/be-hase/context-propagation-report-202309 ), and run.

./gradlew :reactor-netty-issue:bootRun

Possible Solution

None

Your Environment

• Reactor version(s) used: 1.1.11
• Other relevant libraries versions (eg. netty, ...): 4.1.97
• JVM version (java -version): openjdk version "17.0.6" 2023-01-17
• OS and version (eg. uname -a): Darwin Kernel Version 22.5.0
• spring boot: 3.1.4

[Dariusz Jędrzejczyk]

Duplicate of spring-projects/spring-framework#30273 and is being addressed via reactor/reactor-core#3478, please subscribe to that one.

[Ryosuke Hasebe]

Sorry, I didn't know there was a duplicate issue.
This issue is a duplicate, so it's ok to close it.