macOS 27.2 RC (26B118) Built-in display canvas cropped with black bar at bottom-right after login

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Description: MacBook Air M5, using only built-in display. The login window renders full screen normally. After logging into desktop session, the display canvas gets cropped with a black bar on the bottom-right corner. This issue is reproducible in Safe Mode and with a brand-new admin user account. No third-party display or window management software installed. Suspected WindowServer display coordinate calculation bug within user session. Environment Device: MacBook Air M5 OS: macOS 27.2 RC (26B118) Display: Built-in display only, no external monitor Reproduction steps Boot to login window, display works fine Log into desktop session Display canvas cropped, black bar appears at bottom-right

Answered by Train896 in 910508022

This issue first appeared starting with macOS 27.2 beta3. The bug still exists in 27.2 beta4 and 27.2 RC. I hope this can be fixed for the official release.

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Train896 OP

3h

Accepted Answer

This issue first appeared starting with macOS 27.2 beta3. The bug still exists in 27.2 beta4 and 27.2 RC. I hope this can be fixed for the official release.