Launcher won't open Minecraft 18w32a.

How to reproduce:

1. Open Minecraft 18w32a.
2. Open a world in 18w32a.
3. Minimize the world (JAVA).
4. Exit the world (Save and Quit to Title).
5. Exit Minecraft.
6. Open the Minecraft Launcher.
7. Minecraft crashed and "Can't Locate Game Files" 
   Error details: No such file or directory
   Filename on disk: 18w32a.jar
   Path: /Users/Xuan/Library/Application Support/minecraft/versions/18w32a/18w32a.jar
   Exists: false
   Even though you recently just exited out of the game.

How to fix it:
Press close and reopen Minecraft.

P.S. My path is different and has some private information so it's private.