Using "~" as the DIR in a session in the config fails as: No such file or directory

➜  ~ mx add ctl
New session created ∙∙ctl ~  # <----- Fails
bad working directory: No such file or directory

➜  ~ nvim ~/.config/mattock.yaml  # (editing the config)

➜  ~ mx add ctl
New session created ∙∙ctl ~/  # <----- Works