Thermo Sensor not rechecking ambient temperature until reload of save & manual clicking onto it.

I am using thermo sensors as a regolith detection system to tell when regolith has fallen onto the tile the thermo sensor is on. In space, the thermo sensor will read as -460F degrees, until regolith has fallen onto the tile and it heats up to the regolith temperature. However if the regolith has been mined out, the thermo sensor doesn't update it's ambient reading even though the ambient temperatue has gone back to -460.

It doesn't seem to be because of the temperature of the sensor itself, as reloading the game after the regolith is cleared AND clicking on the sensor with my mouse makes it check again and change what it reads back to -460 even when the sensor itself is still very hot.

It's breaking my design and I don't have another solution, as light sensors also don't work for this because sunlight for some reason penetrates 1 tile down and I can't use weight plates for this build as it needs to be a background building.

Fallen Utopia.sav