Summary:
When launching Minecraft Preview, pressing F11 as soon as the “Syncing user data” pop-up appears briefly switches the game between Fullscreen and Windowed mode, but the change is immediately reverted.
If switching from Windowed to Fullscreen, the reversion can cause the game to appear visually squished. The debug overlay indicates the game is still rendering at the fullscreen resolution (e.g., 1920×1080), despite being in windowed mode.
This issue is specific to the 26.30 Preview, as cloud syncing (and the associated pop-up) is not present in 26.20 Stable.
Steps to Reproduce:
Launch Minecraft Preview.
As soon as the “Syncing user data” pop-up appears, press F11.
Observe the game window.
Observed Results:
The game briefly switches display mode but immediately reverts to the previous state. If switching from Windowed to Fullscreen, the game may appear squished. Pressing F11 again resolves the visual issue.
Expected Results:
The game should remain in the selected display mode when F11 is pressed, without reverting.
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