I don't know how old this thread is but I had a question. I am trying to do the dup glitch, the one where you alt f4 the game and I am having a hard time. When I crash the game and go back on the world I end up where I was before I went in to pick up the items. In other words, I am not standing on where the items are and I am not duping anything. I have looked up many videos and I cant seem to find out why this is the case. I even reverted back to the old launcher just to see and still the same thing. I am trying on 1.8.3 I have tried on 1.8 and I even made a micro to see if I just wasn't doing it fast enough. If anyone knows what the deal is then please tell meh.

Ah yes, I have had this problem many times on my laptop, generally I lost the items as well, I think you can fix it by waiting longer before alt f4 ing but do make sure you do all the other stuff like throw it on the ground, leave the world, join the world and then pick it up and alt f4

I am trying what you said to get it dupped but i cant seem to get it, do you have any other method of an idea of why this may happen?? so i can look into fixing it?

It happens on my laptop but not my desktop, have you tried waiting a second or two before you force quit? I think it's processor speed / type but don't quote me on that, although after waiting for a bit longer I think I managed to get it to work. if that doesn't work I use an alternative in my old runs you throw items on the floor and spam escape (the video makes more sense) until the item enters you inventory AFTER the menu pops up, then you save and quit and rejoin and it dupes, in some cases you can use a method l4m2 found were you open a window whilst the game is loading back in, then quit back out again, this should Thereotically dupe your stack infinitely (I have tried) which if your good at the the first part may actually end up slightly quicker real time wise

Recreating a map created in the run should count as what?(if treated as random seed, may happen if I just think it's a good map but I spawn in the wrong place, especially for short run)

If you recreate the map, you recreate the same seed, so it's set seed imo

For map runs, sometimes there may trigger /clear. Placing the items in the crafting bar makes them saved. Is that a glitch?

That would be a very interesting glitch for the map runners. I will test myself. Which version of Minecraft is this?

From 1.7.2 to 1.12 clear keeps them

just checked the bug tracker https://bugs.mojang.com/browse/MC-75328 said this in 2014, no one has ever bothered fixing it or updating it to 1.12, they seem to have forgotten about it . GG man! this could make speedrunning a lot of maps a hella lot easier.

That is actually a glitch and I recall 1 map I used to run that used it as part of the route. http://www.speedrun.com/mcm_tir#No_Pobis_Clip

We called it by the obvious name of "item preserve". Not a lot of maps really work with this because you have to somehow make it through whatever triggers the /clear while in the inventory and if it comes with a teleport it's just not viable most of the time.

this is me trying the duplication trick, but it's not working.. am i missing something? what could be wrong?

@cal i think it is because you didn't threw the item on the ground from your hotbar (i don't no if that is the problem).

@cal and anyone who's having trouble with the dupe. The problem I see in Cal's video is they immediately force quit the game. You should wait about 2 seconds after picking up the item before ALT+F4. This is longer than you might think, so I always just count to myself "1 Mississippi, 2 Mississippi" and then quit.

If i force quit minecraft the launcher wont open hot do i fix?

You can reopen the launcher manually, but there's also a setting to reopen the launcher automatically after closing the game. At least, there was on the old launcher, I've never used the new one.

If you can't find the setting on the new launcher then make a vanilla instance on the twitch launcher and run it from there

If you can't find the setting on the new launcher then make a vanilla instance on the twitch launcher and run it from there

Is it allowed for mod to judge far away to the game rule, or make the run rule against the game rule? Cuz Cavin rejected my submission because I followed the game instruction(video expired)

the duplication glitch works on mac ? I can force quit with cmd + Q