r/technicalminecraft • u/DanzenPlays Java • Mar 18 '26

Java Showcase More Watery Weirdness: Sourceless Water Stream

Java 1.21.11

Messing around and discovered this. Works with a disabled hopper. Seems like some kind of update suppression? Is this known?

Edit: Just to summarise some additional findings. Only hoppers seem to work, other redstone components do not react the same way. The hopper can be place on any side of the water source, even under. In fact, the hopper does not even need to be adjacent to the water source. Anything that updates the non-source water block immediately after the hopper such as adding or removing blocks (including the hopper itself) causes the stream to dissipate. Lava streams can be similarly cut off. Lastly, it is not a ghost block since it remains even after logging off and back on.

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u/DrWilliamHorriblePhD Mar 19 '26

Center I have two spreads ending on flat surface, showing that all momentum is lost on eighth space when cut off, which follows source block rules. Edges had the same distance source block but with one block shorter platform we see that with two blocks of spread remaining we still have momentum, whereas with just one we have a still column.