I started to notice when I clicked Resources Pack in World Create Menu multple times, it will always freeze the game and I’d to force quit to restart the game. 
Step To Reproduce

 1. Open the game.

 2. Navigate to Create New World button.

 3. Click on Resource Pack button.

Expected Results:

The resource pack menu should appear normally.

Observed Results:

The game freezed when clicked on. Hence, you should force quit the game.