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Cauldrons should fill up if they're underwater.

Pretty self explanatory. When a cauldron is fully submerged (at least three water sources being above the cauldron, searched for in a 3x3x1) it should fill up with water. It's a small detail, but it makes sense. If there's empty space, liquid wants to go there. They should act similarly with lava source blocks especially since Lava Cauldrons were added into Java for parity's sake. It would allow for players to make much nicer looking infinite water sources, allowing the player to detect when a cauldron is empty using a comparator, which would cause the cauldron to become submerged briefly, and then when it's full take a separate comparator to push the block back out. There's probably at least a few more technical applications to this as well. I imagine it wouldn't be too hard to make a cauldron flying machine that can clear out areas of water, or collect lava en-masse in the Nether.

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    It should probably also be noted that the top of the cauldron would have to be uncovered as well, so if there was a trapdoor or a glass block etc on top of it, it obviously shouldn't fill up!

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    Registered User commented
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    this would be too op with lava 

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    I don't think it should need to be fully submerged, Rather just have the liquid flow over or sit directly above the top of the cauldron. Would also be neat it the smaller bits of flowing liquid could fill it in gradual increments instead of instantly like a source block or having the fluid fall directly into it. In combination with comparators I'm fairly sure you could use this mechanic to make redstone clocks.