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This happened last night. I bought a renewed Pixel 7 Pro off Amazon and loaded it with GrapheneOS, and have been using the phone for a week.
This black band or screen issue persists after a reboot but doesn't show itself until roughly 10 minutes. On the right side/bevel of the screen, there is a bright teal/green light line that starts to show up before the screen bugs out and "reverts" to this.
I haven't dropped the phone, though I do think it's something to do with previous unseen damage to the screen with it being renewed.
I did read up that GOS has had flickering issues in the past, though I couldn't find anything on the latest stable build.
What do you guys think this could be? Is this screen damage or software issues?