My experience is quite strange but I found similar experiences on Reddit...the screen of my 13 Pro Max is quite perfect in every normal condition except with very low temperatures: if I leave my phone outside for 5/10 minutes without using it, the screen becomes quite green (of course with low brightness and grey background) but If I keep it inside my home and start to use normally, the screen return completely normal and the green tint disappear. Any other feedbacks about this strange topic?