i use tlauncher but i cant see anything different, it does say modified on the screen however it doesnt actually modify the gameplay.

the concept is simple first you must find a beach yes i said a beach not a desert if u cant find a beach just try finding an ocean, then activate F3 and below the X/Y/Z there is Block then what we find below block is Chunks now the chunks must be at 9 13 9 then if you somehow managed to get to 9 13 9 just dig straight down for the treasure