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interior cabin temp rising while car is off

So just had Tesla service again inspect and now they say it’s normal operation as the sun is heating up the sensor.
Seems like a terrible design. For instance today the outside temp is 18 celcius but the overheat protection came on as the cabin states it’s over 40 celcius but in reality it’s about 20 in the cabin
 
Just to add another observation:
I think this is a software calculation bug. The reason I think this is because when the temp states it’s super high, like 40 celcius, if I then the hvac on to its set temp, say 21 celcius, the temp will reduce super fast, within seconds.
So just had Tesla service again inspect and now they say it’s normal operation as the sun is heating up the sensor.
Seems like a terrible design. For instance today the outside temp is 18 celcius but the overheat protection came on as the cabin states it’s over 40 celcius but in reality it’s about 20 in the cabin
 

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