thread_pool::wait doesn't appear to do what it says it does

Hi, I'm trying to understand the behavior of `thread_pool::wait`, the documentation (Boost 1.83) says:

This function blocks until the threads in the pool have completed. If stop() is not called prior to wait(), the wait() call will wait until the pool has no more outstanding work.

Source: https://www.boost.org/doc/libs/1_83_0/doc/html/boost_asio/reference/thread_pool/wait.html

If I have something like:

```cpp
boost::asio::thread_pool thread_pool(10);
...
boost::asio::post(thread_pool_, task0);
....
thread_pool.wait(); //stop was not called so should just wait until the pool has no more outstanding work.
boost::asio::post(thread_pool_, task9999); // hangs forever
```

Since I didn't call `stop` I would expect to be able to post more things to the pool but it appears `wait` actually shutdowns the pool even if `stop` was not called.