Paper/nms-patches/BlockWaterLily.patch

--- a/net/minecraft/server/BlockWaterLily.java
+++ b/net/minecraft/server/BlockWaterLily.java
@@ -19,7 +19,7 @@
 
     public void a(World world, BlockPosition blockposition, IBlockData iblockdata, Entity entity) {
         super.a(world, blockposition, iblockdata, entity);
-        if (entity instanceof EntityBoat) {
+        if (entity instanceof EntityBoat && !org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(entity, blockposition.getX(), blockposition.getY(), blockposition.getZ(), Blocks.AIR, 0).isCancelled()) { // CraftBukkit
             world.setAir(new BlockPosition(blockposition), true);
         }