The lava is stuck on the ceiling and won’t flow.
Environment
a nether fortress in the basalt biome
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This happened to me on 1.24, I think it’s not a bug but rather just a result of world generation. Think of it as the fortress getting its outline down, and carving out a space for itself in the world generation, and kind of setting up a barrier where it is, and since I don’t think lava is meant to be inside fortresses, the lava simply freezes where it is. I have a screenshot of this as well. It could be a bug but I don’t think it is. I don’t know for sure though.
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