Hardcore dieing, window resize, then close: undeletable world

Funny bug: Create an (ingame) undeletable but unplayable hardcore world.

Environment:
new hardcore world (2 times)

Reproduction:

• create hardcore world
• die (I falled from a high place)
• resize the window (I max. it)
  You wont be able to do anything now so:
• close the window with "X"
• restart minecraft
• load the world
  You will see: "Game over" and "Delete world"
• klick "Delete world"

Effect: You will get kicked to the main menu, but the world wont be deleted!
You just can "play" it again: You will see the "Game over" again and again.

You can delete it from the main menu, sure, but not with dieing in the hardcore world

.
Kind regards
fTester

Ps: Note the different time between the pictures (I pressed "delete world" between them)