--- a/net/minecraft/world/level/block/BubbleColumnBlock.java
+++ b/net/minecraft/world/level/block/BubbleColumnBlock.java
@@ -49,6 +_,7 @@
 
     @Override
     protected void entityInside(BlockState state, Level level, BlockPos pos, Entity entity, InsideBlockEffectApplier effectApplier) {
+        if (!new io.papermc.paper.event.entity.EntityInsideBlockEvent(entity.getBukkitEntity(), org.bukkit.craftbukkit.block.CraftBlock.at(level, pos)).callEvent()) { return; } // Paper - Add EntityInsideBlockEvent
         BlockState blockState = level.getBlockState(pos.above());
         boolean flag = blockState.getCollisionShape(level, pos).isEmpty() && blockState.getFluidState().isEmpty();
         if (flag) {
