Paper/paper-server/nms-patches/BlockFireAbstract.patch

--- a/net/minecraft/server/BlockFireAbstract.java
+++ b/net/minecraft/server/BlockFireAbstract.java
@@ -36,7 +36,14 @@
         if (!entity.isFireProof()) {
             entity.setFireTicks(entity.getFireTicks() + 1);
             if (entity.getFireTicks() == 0) {
-                entity.setOnFire(8);
+                // CraftBukkit start
+                org.bukkit.event.entity.EntityCombustEvent event = new org.bukkit.event.entity.EntityCombustByBlockEvent(org.bukkit.craftbukkit.block.CraftBlock.at(world, blockposition), entity.getBukkitEntity(), 8);
+                world.getServer().getPluginManager().callEvent(event);
+
+                if (!event.isCancelled()) {
+                    entity.setOnFire(event.getDuration(), false);
+                }
+                // CraftBukkit end
             }
 
             entity.damageEntity(DamageSource.FIRE, this.b);
@@ -58,14 +65,14 @@
             }
 
             if (!iblockdata.canPlace(world, blockposition)) {
-                world.a(blockposition, false);
+                fireExtinguished(world, blockposition); // CraftBukkit - fuel block broke
             }
 
         }
     }
 
     private static boolean a(World world) {
-        return world.getDimensionKey() == World.OVERWORLD || world.getDimensionKey() == World.THE_NETHER;
+        return world.getTypeKey() == DimensionManager.OVERWORLD || world.getTypeKey() == DimensionManager.THE_NETHER; // CraftBukkit - getTypeKey()
     }
 
     @Override
@@ -83,6 +90,12 @@
     }
 
     private static boolean b(World world, BlockPosition blockposition, EnumDirection enumdirection) {
+        // CraftBukkit start - SPIGOT-6311: Do not calculate portals for up/down directions
+        if (enumdirection == EnumDirection.UP || enumdirection == EnumDirection.DOWN) {
+            return false;
+        }
+        // CraftBukkit end
+
         if (!a(world)) {
             return false;
         } else {
@@ -103,4 +116,12 @@
             return flag && BlockPortalShape.a((GeneratorAccess) world, blockposition, enumdirection.h().n()).isPresent();
         }
     }
+
+    // CraftBukkit start
+    protected void fireExtinguished(GeneratorAccess world, BlockPosition position) {
+        if (!org.bukkit.craftbukkit.event.CraftEventFactory.callBlockFadeEvent(world, position, Blocks.AIR.getBlockData()).isCancelled()) {
+            world.a(position, false);
+        }
+    }
+    // CraftBukkit end
 }