Ice in fridges don't melt after leaving and re-entering the lot

Off the grid capable refrigerators will sometimes not use ice when there is no power. I'm not entirely sure of the trigger conditions, but I've seen it numerous times, both in modded and unmodded games (but the modded games don't have any mods that affect refrigerators or off-the-grid behavior.) I have observed, but only so far in modded games, that when stored power is used up (such as at night when the only power source is solar panels) that ice does start to get used. The "don't use power" switch on refrigerators (available only when there is power available on the off-the-grid lot) also doesn't seem to work, as they don't use ice while that switch is set (again, only observed so far in modded games.)