We have a Service Desk project set up (using one of the old templates from before the rebranding.) The customer notification options are all toggled on. Some of our customers are telling us they're not receiving notifications.

When someone submits a ticket to an org I'm part of, I get a notification, but the messaging (the non-custom part) is confusing. The message says "Click view request and select Get Updates to follow along", but there's also a link in the message to "turn off this request's notifications".

The first one seems to indicate that notifications are opt-in, but the second part indicates that it's opt-out. Actually clicking through to the ticket indicates that notifications are Off. (When it's a ticket I submitted the ticket shows that notifications are On.)

All of this is very confusing. Why would notifications be off on a ticket when our customer notification options are all toggled on? Why would the initial notification give conflicting info about whether a user will receive notifications or not?
The ideal is that all notifications are ON, and customers will receive ALL notifications of tickets created and shared with their organization. Opt-out should be the rule.
Have we mis-configured something, or is this a bug?