i've been mining out very large caverns (dwarven city) and for quite a while i've been having rain fall through the surface into my build. There's probably 20 - 30 blocks between the roof and the surface.
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I created a new world in 21w19a, and when it rains, the rain shows up through all blocks. If I go in a cave, the rain appears everywhere. If I go under the surface of the water in the ocean, the rain also appears everywhere. Could this issue be reopened?
Sorry, I think the issue was that when I generated the spawn chunks, it was without the 1.17 data pack (for cave generation). So the height map was probably wonky, causing the rain to go through blocks. The rain worked normally outside the spawn chunks (after I loaded the 1.17 data pack).
Did you by chance load this world in the 1.16 snapshots, namely 20w17a?
If so, this is almost definitely a duplicate of MC-179845.
Since this is usually due to a broken height map, optimizing the world ("Edit" button on the world in the world selection menu, then "Optimize world") may fix your problem.