In my Org instance I had one project named, Solar Pump.
In that project I had a sprint, Solar Pump Sprint 2, which is now not visible anymore.
I checked active sprints, it was not there.
I checked Sprint Reports for the completed sprints, it was not there.
I checked the backlog section, it was not there.
I checked for Audit logs, Any entries for any kind of operation on Solar Pump Sprint 2 was not present in audit log.
Please help resolve and retrive the issues assigned to the sprint.