This ticket comes from this comment.

The following condition may be modified if we don't need to compare the oldest/stable timestamps with the snapshot time:

            if (first_snapshot_time != snapshot_time || ds_time > snapshot_time ||
              hs_time > snapshot_time || stable_time > snapshot_time ||
              oldest_time > snapshot_time)

The reasoning is that the stable/oldest timestamps should not matter. If a checkpoint has been created at a certain time, we should be able to open the data at that time regardless of the oldest/stable timestamp values.