PaperMC/paper-server/nms-patches/net/minecraft/world/level/block/BlockFluids.patch

--- a/net/minecraft/world/level/block/BlockFluids.java
+++ b/net/minecraft/world/level/block/BlockFluids.java
@@ -39,7 +39,7 @@
 public class BlockFluids extends Block implements IFluidSource {
 
     private static final Codec<FluidTypeFlowing> FLOWING_FLUID = BuiltInRegistries.FLUID.byNameCodec().comapFlatMap((fluidtype) -> {
-        DataResult dataresult;
+        DataResult<FluidTypeFlowing> dataresult; // CraftBukkit - decompile error
 
         if (fluidtype instanceof FluidTypeFlowing) {
             FluidTypeFlowing fluidtypeflowing = (FluidTypeFlowing) fluidtype;
@@ -174,14 +174,20 @@
                 if (world.getFluidState(blockposition1).is(TagsFluid.WATER)) {
                     Block block = world.getFluidState(blockposition).isSource() ? Blocks.OBSIDIAN : Blocks.COBBLESTONE;
 
-                    world.setBlockAndUpdate(blockposition, block.defaultBlockState());
-                    this.fizz(world, blockposition);
+                    // CraftBukkit start
+                    if (org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(world, blockposition, block.defaultBlockState())) {
+                        this.fizz(world, blockposition);
+                    }
+                    // CraftBukkit end
                     return false;
                 }
 
                 if (flag && world.getBlockState(blockposition1).is(Blocks.BLUE_ICE)) {
-                    world.setBlockAndUpdate(blockposition, Blocks.BASALT.defaultBlockState());
-                    this.fizz(world, blockposition);
+                    // CraftBukkit start
+                    if (org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(world, blockposition, Blocks.BASALT.defaultBlockState())) {
+                        this.fizz(world, blockposition);
+                    }
+                    // CraftBukkit end
                     return false;
                 }
             }