you need to place a grass block under a other grass block after set the tickspeed to 0
so, the grass block at the bottom will stay a grass block then , place a bamboo on top of these two grass block then replace (by clic on rigth and left buton at the same time but left before) the grasse block by a bambou, you will crash

////that not work on 1.17 but that work on 1.16.5 i dont now if its only for this version of if that work for older ver.////