Context propegation lost over CompletableFuture/Promise.async

[necrolyte2]

Describe the bug
It seems that context is being lost if there is a CompletableFuture or a Promise.async wrapped around a CompletableFuture

Steps to reproduce
Run the following project
https://github.com/necrolyte2/ratpack-kotlin-otel/releases/tag/2.0.1

docker-compose up
for ep in http onlyhttp onlycassandra cassandrahttp; do curl http://localhost:5050/api/v1/${ep}/1; done

View the traces in the jaeger ui at http://localhost:16868

What did you expect to see?
There should be a single trace that contains all of the spans for this single endpoint call

What did you see instead?
Each http call is generating its own trace instead of using the parent trace id

What version are you using?
All OTEL versions seem to have this issue

Environment
Compiler: AdoptOpenJDK 11.x

Additional context
Screenshots are included in the tagged release page
https://github.com/necrolyte2/ratpack-kotlin-otel/releases/tag/2.0.1