[macOS 27.3 Beta Regression] Enabling "Show Menu Bar Background" Causes Windows to Flicker, Jump, and Resize During Dragging

After updating my MacBook Pro (M4) to macOS 27.3 Beta (26C5035r), application windows flicker or flash while I drag them. They also unexpectedly jump to random positions and change size. This did not happen before the update.

I have isolated the behavior to the "Show Menu Bar Background" setting ("Menü çubuğu arka planını göster" in Turkish). With this setting enabled, the problem occurs. Disabling it completely eliminates the problem on the same Mac.

Steps to reproduce:

1. Enable "Show Menu Bar Background" in System Settings.
2. Open an application window and drag it by its title bar around the desktop.
3. Observe the flickering/flashing and unexpected changes in position and size.
4. Disable "Show Menu Bar Background" and repeat the dragging action. The problem disappears.

Expected behavior: Windows should move smoothly with the pointer and keep their size unless intentionally resized.

Actual behavior: Dragged windows flicker, jump, and resize unexpectedly when the menu bar background is enabled.

Workaround: Leave "Show Menu Bar Background" disabled.

Has anyone else encountered this after the same update? Is there another workaround that allows the menu bar background to remain enabled?