Purple fringing with ProRAW edits.

Up until recently, I never really took cell-phone cameras too seriously b/c they had such incredibly limited dynamic range. The iPhone 12 Pro Max with Apple ProRAW changed my mind. That said, I've noticed strange purple fringing (banding not chromatic aberration) when editing RAW images (taken on the 12 Pro Max) with the Apple Photos app. Generally, the phenomena occurs when pushing highlights. Curious, I opened the same files in Adobe Lr Mobile and the purple banding disappeared. The Apple ProRAW images were much easier to edit in Lr Mobile. Example below, shows the banding in the highlights around the sun. I should be able to push the highlights much further. In Lr this is not an issue and pushing the highlights does not induce purple banding. Once the image is saved, the banding remains. Looks subtle in this highly compressed image below, but it's actually quite pronounced. Am I missing something?

iPhone 12 ProMax running iOS 14.4