Defective Camera?

Hi! So a few days ago my iPhone XS rear camera started having a purple tint formed when I aimed it at dark areas. In areas with proper lighting the purple tint is not visible and even if there it's very light and not noticeable. This only applies to the rear camera on normal photo and video mode. On portrait mode the purple tint doesn't show up. Selfie cam also works fine. I've not dropped my iPhone at all and there are no cracks on the camera at all. Is this a defective camera? I'm still covered under AppleCare so will I have to pay for any repairs?