RG450G - system health print empty after updating firmware

Hi everyone, I took a gamble and upgraded the firmware on my RG450G, I went from 3.41 to 6.42.1.

I can’t see system temperature or voltage anymore in system health, not sure what’s going on here. Do i need to downgrade the firmware?

[admin@MikroTik] /system health> print

[admin@MikroTik] /system health> ..
[admin@MikroTik] /system> routerboard
[admin@MikroTik] /system routerboard> print
routerboard: yes
model: 450G
serial-number: xxxxxxx11223344
firmware-type: ar7100
factory-firmware: 3.02
current-firmware: 6.42.1
upgrade-firmware: 6.42.1

Upgraded routeros to 6.42.3 and the health status returned. I then upgraded the firmware to match and it still worked.

[admin@MikroTik] > system health print
voltage: 25.5V
temperature: 38C

Same thing is happening on v6.42.6…