GDK: Switching to another window while loading a world will cause the cursor to stay at the center after the world is loaded

Steps to reproduce the issue:

1. Open Minecraft and enter a world.

2. While the game is loading, use Alt+Tab to switch to another window.

3. Wait until the game finishes loading the world in the background.

Expected result:

After the game finished loading the world in the background, the cursor wouldn’t stay at the center, and the game would pause automatically.

Actual result:

The cursor stays at the center, the game isn’t paused automatically, and you can even move the camera of the game even if it is in the background; the keyboard won’t work, though.