Repeatedly pressing the ESC key while transferring between servers shows a broken pause menu and soft locks the game

When transferring between server, and then you repeatedly clicking the ESC key on the loading screen, it will shows a broken pause menu and completely soft locks the game.

Steps to reproduce:

1. Join Mob Maze or SoulSteel

2. From main lobby, teleport into the maze (if you're on Mob Maze) or into any dungeons (if you're on SoulSteel)

3. When the loading screen shows and the cancel button is not visible yet, start repeatedly clicking the ESC key

4. Observe

Expected results:
When the cancel button is visible, the loading screen will close, and then the world/server list appears.

Observed results:
When the cancel button is visible, the loading screen will close, and then a broken pause menu appears, pressing any button in there does nothing.