To check whether this was working correctly, I changed my view to browse the "Resolved Requests" filter

 

I also added the "Resolved Date" column to my fields.

So I was able to keep an eye on tickets that had a resolved date of the day before, and made sure they disappeared (eg: were closed off) when the time came around.

I noticed one with a date of several days ago. 

This should have been auto-closed on 4/9/18 but is still in Resolved status as of 6/9

I looked through the ticket history, and could see that it was indeed resolved on 3/9....

.... however it was reopened after that, and then Resolved again on 6/9

I've seen other tickets like this, and the good news is they do get autoclosed a day after the new Resolved date.  

However, is there a reason this date doesn't update automatically in the Resolved Date field if a ticket has been resolved more than once?

Has this been fixed in a later release, and if so which one?