those are the most important cases

mission/tcs/Max31865EiveHandler.cpp

@@ -37,6 +37,8 @@ void Max31865EiveHandler::doShutDown() {
     transitionOk = false;
   }
   if (state == InternalState::INACTIVE and transitionOk) {
+    sensorDataset.temperatureCelcius = thermal::INVALID_TEMPERATURE;
+    sensorDataset.setValidity(false, true);
     updatePeriodicReply(false, EiveMax31855::RtdCommands::EXCHANGE_SET_ID);
     setMode(MODE_OFF);
   }