--- a/net/minecraft/world/level/block/entity/SculkCatalystBlockEntity.java
+++ b/net/minecraft/world/level/block/entity/SculkCatalystBlockEntity.java
@@ -86,7 +86,9 @@
     }
 
     public static void serverTick(World world, BlockPosition blockposition, IBlockData iblockdata, SculkCatalystBlockEntity sculkcatalystblockentity) {
+        org.bukkit.craftbukkit.event.CraftEventFactory.sourceBlockOverride = sculkcatalystblockentity.getBlockPos(); // CraftBukkit - SPIGOT-7068: Add source block override, not the most elegant way but better than passing down a BlockPosition up to five methods deep.
         sculkcatalystblockentity.sculkSpreader.updateCursors(world, blockposition, world.getRandom(), true);
+        org.bukkit.craftbukkit.event.CraftEventFactory.sourceBlockOverride = null; // CraftBukkit
     }
 
     @Override