We have Windows 2019 server with latest smartmontools installed.
On this server following disk configuration (as reported by smartctl):
C:\Program Files\smartmontools\bin>smartctl.exe --scan
/dev/sda -d sat # /dev/sda [SAT], ATA device
/dev/sdb -d scsi # /dev/sdb, SCSI device
/dev/csmi0,0 -d ata # /dev/csmi0,0, ATA device
/dev/csmi0,2 -d ata # /dev/csmi0,2, ATA device
/dev/csmi0,3 -d ata # /dev/csmi0,3, ATA device

sda is ordinary disk, sdb - BIOS FakeRAID massive, csmi0,0,0,2 and 0,3 raid disks.
When running
zabbix_agent2 -c c:\zabbix\conf\zabbix_agent2.conf -t smart.disk.get -v > 1.1
we see that agent2 goes to infinite loop by probing all type of raids and number for sda dispite the fact that error code is returned.
Similar problem described in russian here:
https://www.zabbix.com/forum/in-russian/437582-zabbix-agent-2-smart-plugin-windows

log attached.