Even though Tesla claimed that it has solved this already known issue of the Model 3 and Model Y with a software update, owners are still reporting heat pump failures which could potentially lead to life-threatening situations when driving these electric cars in very cold winter conditions.
https://www.notebookcheck.net/Tesla-Model-3-and-Model-Y-owners-complain-about-heat-pump-failures-at-low-temperatures.592612.0.html