Reproducer sample using Spring Boot Api Gateway

I created this sample to report an error observed OpenTelemetry auto-instrumentation agent. The spring-boot application is always run with jvm options -javaagent:opentelemetry-javaagent.jar -Dotel.traces.exporter=jaeger -Dotel.metrics.exporter=none -Dotel.exporter.jaeger.endpoint=http://localhost:14250
To reproduce the observed error I use the sample in http://localhost:8080/controller/backendmap.

see open-telemetry/opentelemetry-java-instrumentation#5186

Starting the sample:

• start jaeger locally
• copy opentelemetry agent jar to file opentelemetry-javaagent.jar, e.g. version v1.10.0 or v1.9.2
• run spring boot with opentelemetry agent injected with ./gradlew -Pprofile=agent bootRun

Behavior since v1.10.0

Two traces are created, although I would only expect one.

First trace for incoming web request on /controller/backendmap.

unknown_service:java /controller/backendmap
    unknown_service:java ApiGatewayController.backendmap
    unknown_service:java HTTP GET
        unknown_service:java /controller/pojo
            unknown_service:java ApiGatewayController.getPojo

Second trace created in Mono operation <mono>.flatMap(it -> requestMojo()); in ApiGatewayController#backendMap

unknown_service:java HTTP GET
    unknown_service:java /controller/mojo
        unknown_service:java ApiGatewayController.getMojo

Expected behavior until agent v1.9.2

This is the expected behavior. Both outgoing http-client (/controller/pojo and /controller/mojo) calls are stitched to the initiating incoming webrequest /contoller/backendmap.

unknown_service:java /controller/backendmap
    unknown_service:java ApiGatewayController.backendmap
    unknown_service:java HTTP GET
        unknown_service:java /controller/pojo
            unknown_service:java ApiGatewayController.getPojo
    unknown_service:java HTTP GET
        unknown_service:java /controller/mojo
            unknown_service:java ApiGatewayController.getMojo