SOCs Thermal zone information get stuck?

Building heaps of stuff the phone gets pretty warm and the max170xx_battery updates but SOCs thermal zones don't change:

# cat /sys/devices/virtual/thermal/thermal_zone*/temp 
38000
39000
39000
47900

and later on

# cat /sys/devices/virtual/thermal/thermal_zone*/temp 
38000
39000
39000
36400

so over 1h of building the SoCs zone didn't change at all for me while the battery one does - i mean we have better thermal conductance but that looks too good.

This is on 5.11.0-1-librem5 but @eric.kuzmenko also saw this and i presume he's on 5.9.