Nissa
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The MLG water trick takes a lot of practice because you need to get the timing just right. It can also very easily fail you because of lag (which I suspect is what happened here considering your frame rate).
It's my singleplayer creative world, and it's on vanilla with one datapack that just lets me put TNT into beehives.
I took a video demonstrating it, but I couldn't get it small enough to upload, so I put it on YouTube instead - https://youtu.be/n6PDPlOHIG0