public class GraftlingCertaintyFeat {
    private static final ResourceLocation NAME = new ResourceLocation(EposAPI.ID, "graftling_certainty");
    @SuppressWarnings({"ConstantConditions", "deprecation"})
    public static final Feat FEAT =
            FeatBuilder.start(NAME)
                    .withEventHandler(BlockEvent.HarvestDropsEvent.class,
                            (harvestDropsEvent, entity, iCharacterStats) -> {
                                if (harvestDropsEvent.getState().getBlock() instanceof LeavesBlock && !harvestDropsEvent.isSilkTouching()) {
                                    LeavesBlock block = (LeavesBlock) harvestDropsEvent.getState().getBlock();
                                    boolean containsSapling = false;
                                    List<ItemStack> stacks = harvestDropsEvent.getDrops();
                                    for (ItemStack stack : stacks) {
                                        if (stack.getItem().isIn(ItemTags.SAPLINGS)) {
                                            containsSapling = true;
                                        }
                                    }
                                    if (block.isIn(BlockTags.LEAVES) && !containsSapling) {
                                        LootContext.Builder context = new LootContext.Builder(entity.world.getServer().getWorld(entity.dimension));
                                        List<ItemStack> stackList = new ArrayList<>();
                                        for (int i = 0; i < 10; i++) stackList.addAll(block.getDrops(harvestDropsEvent.getState(), context));
                                        for (ItemStack stack : stackList) {
                                            if (stack.getItem().isIn(ItemTags.SAPLINGS)) {
                                                harvestDropsEvent.getDrops().add(new ItemStack(stack.getItem(), 1));
                                            }
                                        }
                                    }
                                    harvestDropsEvent.setDropChance(1f);
                                }
                            }).finish();
}