craftbukkit/nms-patches/net/minecraft/world/level/block/CaveVines.patch

--- a/net/minecraft/world/level/block/CaveVines.java
+++ b/net/minecraft/world/level/block/CaveVines.java
@@ -19,6 +19,13 @@
 import net.minecraft.world.level.gameevent.GameEvent;
 import net.minecraft.world.phys.shapes.VoxelShape;
 
+// CraftBukkit start
+import java.util.Collections;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.event.player.PlayerHarvestBlockEvent;
+// CraftBukkit end
+
 public interface CaveVines {
 
     VoxelShape SHAPE = Block.box(1.0D, 0.0D, 1.0D, 15.0D, 16.0D, 15.0D);
@@ -26,7 +33,24 @@
 
     static EnumInteractionResult use(@Nullable Entity entity, IBlockData iblockdata, World world, BlockPosition blockposition) {
         if ((Boolean) iblockdata.getValue(CaveVines.BERRIES)) {
-            Block.popResource(world, blockposition, new ItemStack(Items.GLOW_BERRIES, 1));
+            // CraftBukkit start
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(entity, blockposition, (IBlockData) iblockdata.setValue(CaveVines.BERRIES, false))) {
+                return EnumInteractionResult.SUCCESS;
+            }
+
+            if (entity instanceof EntityHuman) {
+                PlayerHarvestBlockEvent event = CraftEventFactory.callPlayerHarvestBlockEvent(world, blockposition, (EntityHuman) entity, net.minecraft.world.EnumHand.MAIN_HAND, Collections.singletonList(new ItemStack(Items.GLOW_BERRIES, 1)));
+                if (event.isCancelled()) {
+                    return EnumInteractionResult.SUCCESS; // We need to return a success either way, because making it PASS or FAIL will result in a bug where cancelling while harvesting w/ block in hand places block
+                }
+                for (org.bukkit.inventory.ItemStack itemStack : event.getItemsHarvested()) {
+                    Block.popResource(world, blockposition, CraftItemStack.asNMSCopy(itemStack));
+                }
+            } else {
+                Block.popResource(world, blockposition, new ItemStack(Items.GLOW_BERRIES, 1));
+            }
+            // CraftBukkit end
+
             float f = MathHelper.randomBetween(world.random, 0.8F, 1.2F);
 
             world.playSound((EntityHuman) null, blockposition, SoundEffects.CAVE_VINES_PICK_BERRIES, SoundCategory.BLOCKS, 1.0F, f);