

Can anyone hazard a guess what happened to my truck?
It's a 2020 Sierra Denali, I wash it every other week as needed. I've had it 4 months, it has no previous damage to the area. I washed it Friday, didn't drive it Saturday and went to climb in this morning and found this. It was 30C/80F yesterday and parked next to my plastic garbage bins but there was nothing reflecting onto it but I always park there and have never had an issue.
Any advice would be appreciated.