Detaching from server started with `wemux start` exits tmux

[saleyn]

I am starting a server with wemux start and detaching from it using Ctrl-b,D. I expect that that should leave the tmux session running in the background. However it looks like that session gets killed upon detaching, and tmux list states that there are no servers.

How do you detach and leave the session running so that it's possible to re-attach later?