When an item is renewed the lost status isn't removed - but if you check in a lost item it is.  It seems like the lost status should be removed when an item is renewed.

This is from IRC:
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[08:26]  <nengard> hey #koha I'm wondering did renewing an item ever clear the lost status on that item? I don't think it did - but want to check before I report a bug/enh
[08:28]  <oleonard> nengard: Do you think it should or shouldn't?
[08:31]  <oleonard> If the item is long overdue (lost) I would say it should--if you renew it it's not overdue anymore!
[08:31]  <oleonard> ...but it doesn't in master.
[08:35]  <oleonard> ...and didn't in 3.14.x.
[08:37]  <nengard> i don't know really if it should or shouldn't
[08:37]  <nengard> when you check in an item that was lost it makes it not lost
[08:37]  <nengard> so i think renewing should be the same ... right?
[08:39]  <oleonard> I would consider it a bug, but it's a long-standing behavior so I wonder what others think.
[08:45]  <oleonard> In my library the only time someone would have something checked out which was lost would be long overdue (lost), and normally those items would not be eligible for renewal
[08:45]  <oleonard> So maybe it's just never come up for us.