Water sieve not updating stored polluted water temp

When only 1 water sieve is fed continuously through pipes, the polluted water temperature in its storage isn't updated with incoming 5kg packets of polluted water.

This leads to the output water being much higher temperature than the input polluted water since the stored polluted water doesn't cool down (i had 60°C water output with a 18.6°C polluted water input). Sand temperature was 52°C so it wouldn't explain the massive heat increase.

This seems to happen only when the temperature of the polluted water goes down, when it goes up the stored polluted water temperature goes up too.

This persists on reloading the game, only way to fix it is to stop polluted water input long enough to empty the water sieve storage.

The Cute Supernova.sav