Tickets were showing fine in both the backlog and active sprint board. After a while, tickets assigned to a particular user stopped showing in the backlog (but it shows up fine in the active sprint).
The filter query shows the tickets fine, the only place the tickets are not showing is at the Backlog view. I don't even see that particular user in the row where we can select users and the tasks will be filtered by assigned user.
I've tried searching for the indexing issue but it doesn't seem like it's available for JIRA Cloud users anymore. Not sure what to try anymore.