hello I come to report a serious bug of the pointed_dripstone when you place the lava when you place the dripstone the lava disappears it does not remain like water

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I believe you are talking about waterlogging. This is an intentional feature, but lava-logging is currently not in the game. If you want, you can visit the Suggestions Page to suggest or vote for lava-logging.

Edit: Is that what you're talking about, like how you can place signs in water source blocks?