ConcurrentStream::collect blocking on single threaded tokio

[Yohe-Am]

Hey, so maybe I'm misusing something somewhere but I was able to debug the hangs of a codebase to an invocation of into_co_stream on a Vec. From what I can see using tokio-console, the task this is running on seems to be awake most of the time but I'm not sure if it's refusing to yield. And yeah, this problem only happens sometimes more commonly when the system is generally resource constrained.

I haven't really done any investigation beyond this but I'm willing to provide code and more. Opening this quickly before I forget.