For what it's worth, I tested master (2506f44) with a test user, and a test checkout and was NEVER able to get "Last Activity" to populate. I then realized, "activity" means an OPAC login (maybe other things?) so I logged in with the test user and was able to duplicate Ben's initial report.
Search by ID works, search by barcode results in <Unset> as reported.
For what it's worth, I tested master (2506f44) with a test user, and a test checkout and was NEVER able to get "Last Activity" to populate. I then realized, "activity" means an OPAC login (maybe other things?) so I logged in with the test user and was able to duplicate Ben's initial report.
Search by ID works, search by barcode results in <Unset> as reported.