>>1389773>>1389777If it's never been outside ever, it could still be sunburn if you moved it directly into full sun (though that's what I did with mine too at some point and it didn't care, then again I'm much farther north than you with weaker sun).
I also exposed mine to temps down to just above freezing but never below 0°C - was there frost already in your area?
Also consider x-posting here:
>>>/an/thread/2845907