You are right. I have left thread_group a little bit on the road. Please, could you create a ticket? I will fix this very soon.Not sure if it can be defined as a "bug", but thread_group definitely
doesn't keep up with all the new thread features.
Please, could you post a short example that shows the issue?Understood. A question then: why did this thread became unjoinnable? It was never explicitly detached.