for some reason, i was in my testing world, i entered the end and then after some time i left it. and for some reason, the game froze. so i exited it from task manager and tried to enter the world again. but after it says that the world is loading, it says 0% on the screen, and nothing else happening.
Please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher to this ticket.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".