Lava in a singleplayer world appears to take the texture of water. Using a lava bucket plays the sound of placing water rather than placing lava. Water flowing over lava or the opposite does not create cobblestone or obsidian. Instead, it acts like they are the same fluid. Water can even be placed in the nether. The flow rate and particles/sound effects of lava are still normal.
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@iTechieGamer Not using any resource pack that changes the lava texture. This is obviously more than a texture issue, since I can place water in the nether and the collision between water and lava doesn't produce blocks.
Does MC-129838 describe your issue?
@tryashtar Yes. I have the vanilla datapack disabled, and I need it to stay disabled. How do I go around this issue?
See comment of @unknown in MC-129244:
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The issue you are reporting now, which is specific to not loading vanilla datapack, is working as intended. If you do not provide a definition of what lava is, the client will not know and that is undefined behaviour. If you intend to replace vanilla datapack you must make your own definitions of things instead.
Cannot confirm. Make sure that you are not using any resource pack