Game freaks out when you "delete" hardcore world as soon as you die

*how to reenact*
Step 1: 

Make a hardcore world

Step 2: Jump off a cliff on the world high enough to commit not alive

Step 3: As soon as you die click the Delete World button

Step 4: Click "single player" then "Create new world" 

Step 5: You should be able to see the death screen of that world
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Problems
1: If you leave the game it doesn't turn off, you have to use task manager

2: I broke my desk because I died to a creeper on my hardcore world that I had for 4 weeks