The couple of times I've seen this (in real life) is when there's been bumper damage touched up, and they didn't prep well for the clear coat and so it begins to peel.
If you're a DIY-er you might try loosening that piece and going through a variety of progressively finer sanding / polishing steps and cross your fingers it stops at that edge.
You could try try the dealership, there's a chance they have record of it if it happened during shipping or transport to the dealer, and if so they'd need to fix this. No guarantee though because it can happen at that point in time and be taken care of under the radar and not recorded.
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