Serial number missing from View Disks but shell sees it

Hi, I'm testing 9.2.1.8 on a Supermicro X10SL7-F, 16GB RAM, six 4TB Seagate NAS drives connected to the onboard SAS, flashed to IT mode in a single Z2 volume.

I noticed in View Disks, the serial number for one drive,da0, was missing. The volume was healthy.

At first I thought it was a bad cable, SATA port, or drive. So I did some cable/port/drive swapping without any answers.

But then I noticed that all the drive serial numbers were seen by the shell.

Does anybody have any thoughts?

Thanks!