Game freezes for several seconds after exiting the "Export World" screen

Summary:

In the current Preview, the game becomes unresponsive for several seconds after exiting the Export World screen. This issue is specific to Preview and does not occur in 26.44.

Steps to Reproduce:

1. Launch Minecraft Preview.

2. Create a new world.

3. Exit the world.

4. Press the Edit button (pencil icon) next to the world.

5. Press Export World.

6. Press Cancel or the Back button.

7. Observe the game's performance.

Observed Results:

The game freezes and becomes unresponsive for several seconds after pressing Cancel or Back.

Expected Results:

The game should return to the previous screen without freezing or becoming unresponsive, matching the behavior in 26.44.