async_channel with tokio feature can deadlock

When activating the tokio feature of zbus, I am seeing frequent deadlocks (around 10% of the time). The source appears to be the mutex used to make a tokio mpsc channel mpmc here:

https://gitlab.freedesktop.org/dbus/zbus/-/blob/main/zbus/src/abstractions/async_channel.rs#L48

Removing the tokio feature from my dependent crate eliminates the deadlocks.