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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 23 Apr 2020 01:36:39 -0400
Subject: [PATCH] Don't fire BlockFade on worldgen threads


diff --git a/src/main/java/net/minecraft/world/level/block/FireBlock.java b/src/main/java/net/minecraft/world/level/block/FireBlock.java
index f44457c0d75efe323cc8242ef5173a3d5067fad0..065d6164b5c9d65d20e7790c607d77e9ad70dfef 100644
--- a/src/main/java/net/minecraft/world/level/block/FireBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/FireBlock.java
@@ -108,6 +108,7 @@ public class FireBlock extends BaseFireBlock {
     @Override
     protected BlockState updateShape(BlockState state, LevelReader world, ScheduledTickAccess tickView, BlockPos pos, Direction direction, BlockPos neighborPos, BlockState neighborState, RandomSource random) {
         // CraftBukkit start
+        if (!(world instanceof ServerLevel)) return this.canSurvive(state, world, pos) ? (BlockState) this.getStateWithAge(world, pos, (Integer) state.getValue(FireBlock.AGE)) : Blocks.AIR.defaultBlockState(); // Paper - don't fire events in world generation
         if (!this.canSurvive(state, world, pos)) {
             // Suppress during worldgen
             if (!(world instanceof Level world1)) {
@@ -123,7 +124,7 @@ public class FireBlock extends BaseFireBlock {
                 return blockState.getHandle();
             }
         }
-        return this.getStateWithAge(world, pos, (Integer) state.getValue(FireBlock.AGE));
+        return this.getStateWithAge(world, pos, (Integer) state.getValue(FireBlock.AGE)); // Paper - don't fire events in world generation; diff on change, see "don't fire events in world generation"
         // CraftBukkit end
     }