Drives won't spindown after a scheduled scrub task, which completed

drive spindown worked fine for a while. However, after standard scrub task they no longer spindown; persists after reboot. I have spun the disks down manually with hdparm and they stay off (as long as smart is disabled; even though it is set to standby). Additionally, reports does not show any read/writes. Any troubleshooting tips for this would be great! (top & iostat are useless to me)

FYI: system disk is not in the pool with theses disks

Hardware list?
Spindown method?

Hardware list?

Does that matter if it was working fine before? (I did not make any changes to cause this)

Spindown method?

the method provided by truenas scale in the gui (adv power option 1)

Just to reiterate, the disks spindown fine with hdparm -y (and stay down)

I’m pretty sure the problem is with however truenas tracks dormant drives. But I have no idea which process or logs to look at. Thanks.