The bug
A re-created Hardcore game isn't Hardcore (despite the 'Game Mode' button displaying 'Hardcore') unless you cycle through game modes and reset it to Hardcore.
How to reproduce
Select a hardcore game and then 'Re-Create'
Don't change the game mode settings
Select 'Create New World' button
→ ❌ Notice that a survival world has been created even though the 'Game Mode' button said 'Hardcore'
Code analysis
Code analysis by @unknown can be found in this comment.
Related issues
is duplicated by
Comments
migrated
migrated
I didn't check if this same thing would happen with any of the other game modes.
migrated
Confirmed in 13w04a
migrated
13w19a. The level.dat of re-created hardcore world has TAG_Byte(hardcore) set to 0, while the original is 1.
migrated
Confirmed in 14w03b
migrated
Does this default any other settings (such as if structures were turned off, the chest was turned on, etc.)?
marcono1234
Confirmed for
14w29b
14w30c
14w31a
Minecraft 1.8-pre 1
Interesting question ggxl, but it seems like it only affects hardcore mode (tried with creative mode and re-create and worked fine) also with chests, it just seems like it sets it to false when pressing re-create, but when you check the settings before re-creating it also says that you have bonus chest set to false
marcono1234
Confirmed for
15w37a
migrated
I think that "recreate" doesn't make the same world, it automatically fills in the seed. You can still change the options surrounding the world
SunCat
It shoud set the same set up options as in the original world (such as world type, gamemode, bonus chest and so on)
migrated
Confirming for 1.9
marcono1234
Please link to this comment in the description
The following is based on a decompiled version of Minecraft 1.10 using MCP 9.30.
This is happening because the method net.minecraft.client.gui.GuiCreateWorld.recreateFromExistingWorld(WorldInfo) is not setting the boolean field net.minecraft.client.gui.GuiCreateWorld.hardCoreMode to true. This should be fixed by removing this field completely and determining if a gamemode is hardcore by the net.minecraft.client.gui.GuiCreateWorld.gameMode field only. In case there will be game modes other than "hardcore", which have the same hardcore mechanism however, the gamemodes could be enum values that overrite the method toString() to return the String version and have a method that returns whether or not a mode is hardcore.
bemoty
Still happens in 16w32b.
bemoty
Confirmed for 1.11.2
bemoty
Can confirm for MC 1.12.1.
migrated
Confirmed for 1.13.1. Please, if you don't mind, I'd like to be the reporter of this issue, I'll update it accordingly.
migrated
It would be nice if Mojang fixed (ancient) bugs like this instead of adding new content to the game. Mods can already add more content to the game than Mojang can dream of, but they can't fix bugs, so Mojang is ultimately just wasting time. ¬_¬
boq
Confirmed in 1.4.7.