PaperMC/nms-patches/BlockFluids.patch

--- a/net/minecraft/server/BlockFluids.java
+++ b/net/minecraft/server/BlockFluids.java
@@ -57,10 +57,10 @@
     public VoxelShape a(IBlockData iblockdata, IBlockAccess iblockaccess, BlockPosition blockposition) {
         Fluid fluid = iblockaccess.getFluid(blockposition.up());
 
-        return fluid.c().a((FluidType) this.b) ? VoxelShapes.b() : (VoxelShape) this.o.computeIfAbsent(iblockdata, (iblockdata) -> {
-            Fluid fluid = iblockdata.s();
+        return fluid.c().a((FluidType) this.b) ? VoxelShapes.b() : (VoxelShape) this.o.computeIfAbsent(iblockdata, (iblockdata1) -> { // CraftBukkit - decompile errors
+            Fluid fluid1 = iblockdata1.s();
 
-            return VoxelShapes.create(0.0D, 0.0D, 0.0D, 1.0D, (double) fluid.getHeight(), 1.0D);
+            return VoxelShapes.create(0.0D, 0.0D, 0.0D, 1.0D, (double) fluid1.getHeight(), 1.0D);
         });
     }
 
@@ -117,14 +117,20 @@
                 Fluid fluid = world.getFluid(blockposition);
 
                 if (fluid.d()) {
-                    world.setTypeUpdate(blockposition, Blocks.OBSIDIAN.getBlockData());
-                    this.fizz(world, blockposition);
+                    // CraftBukkit start
+                    if (org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(world, blockposition, Blocks.OBSIDIAN.getBlockData())) {
+                        this.fizz(world, blockposition);
+                    }
+                    // CraftBukkit end
                     return false;
                 }
 
                 if (fluid.getHeight() >= 0.44444445F) {
-                    world.setTypeUpdate(blockposition, Blocks.COBBLESTONE.getBlockData());
-                    this.fizz(world, blockposition);
+                    // CraftBukkit start
+                    if (org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(world, blockposition, Blocks.COBBLESTONE.getBlockData())) {
+                        this.fizz(world, blockposition);
+                    }
+                    // CraftBukkit end
                     return false;
                 }
             }