I have an LG OLED from about 8 years ago, and I do some rather pronounced burn in. I was also rather careful about leaving anything fixed on the screen. I have some friends with a slightly newer panel and they too have burn in. So maybe lucky? Or maybe your generation of panel is less susceptible than mine.

That said, I’m about to renovate my house, and when I’m done I’ll consider buying another OLED panel. Worth it in my opinion.