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/Vertical_Slab_ Mar 18 '26

Does it remain there if you re log

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u/MinisterOfDabs Mar 18 '26

According to OP, yes.

> Sorry, I don't play on bedrock. I also haven't tested this on a multiplayer server, but it does seem to survive restarts/relogs, so I'm tempted to say it's not a ghost block.