Unlisted topics get sent on mailing list mode

I created some posts using the RSS Polling guidance with embed unlisted set to true.

In the end I decided not to have them initially unlisted - but I noticed that a user who has “mailing list mode” set got email notifications of each of the unlisted posts.

I didn’t see it mentioned in Understanding closed, unlisted, and archived topics

Based on some quick tests, it seems that activity in unlisted topics will cause an email to be sent to users who have enabled mailing list mode. I’m not sure if this is the expected behaviour though.