White spot on Forerunner 955 Solar has appeared suddenly after 3yr use

Hey everyone! Yesterday, my 955 Solar, which I bought in Sep 2022 woke up with a white spot in the corner, which initially looked like dead pixels, but on closer inspection, it turns out the spot is there even when the watch is turned off. Also, it seems that light comes out of it when viewed from the side. Does anyone know what the cause of this is?