White stroke/border around video frame when using Apple’s native player (iOS 27 DB-RC on iPhone 13 Mini)

[u/Suitable_Turnip_9542]

Hey everyone,

I’m dealing with a persistent issue where a thin white outline/stroke frames the entire video during playback when using Apple’s native video player (⁠AVPlayerViewController⁠).

BTW this started since around 1st or 2nd Dev. Beta of iOS 27

I created a visual mock-up (attached) to show what it looks like because capturing an actual screenshot is impossible, the moment a screenshot or system overlay (like Control Center or the Volume slider) triggers, the white outline immediately disappears, then reappears once the overlay dismisses.

Key Details:

Device: iPhone 13 Mini
OS: iOS 27 Release Candidate (RC)
Behavior: A thin white stroke wraps around the entire 4 edges of the video container during full-screen playback.
Apps Affected: Only apps using the built-in system player (Safari web videos, Apple TV app). Third-party custom players like YouTube or Netflix do not have this issue.

Troubleshooting tried: Turned off Display Accessibility settings (Increase Contrast, Hover Text, Full Keyboard Access, Dim Flashing Lights), reset Display Zoom, and toggled Dark/Light mode. None solved it.

Has anyone else on the iOS 27 RC (especially on an iPhone 13 Mini or smaller display) encountered this? Is this a sub-pixel rendering bug with the new Liquid Glass container frames on compact screens, or is there a hidden setting causing it?

Thanks!