From the mud on the stalactite flows lava in nether

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No, it's not a suggestion or an idea, it's a bug. How can lava flow from a wet block?

All stalagtites drip lava in the nether, water cannot exist in ultrawarm dimensions. So yes, it is a change suggestion.

Pointed dripstone should not drip water particles in the Nether (fix of MC-206553).