21:9 App Store header video is heavily cropped on iPhone

I created an App Store header video at the required resolution of 3840 × 1646 (21:9), but on an actual iPhone it appears enlarged, cutting off text and images on both sides. I’ve attached one screenshot. Is this expected behavior? What are the recommended safe-area dimensions for header videos?

Device: iPhone 16 Pro Max iOS: 27.0.1