BlockDropItemEvent's multi-block structure support doesn't applies to sugarcane/bamboo/cactus/scaffolding

Expected behavior

BlockDropItemEvent's #getItems() should return multi block structure's all drops. but it doesn't return when it's sugarcane, bamboo, cactus, scaffolding. it can be more that I don't tested.

so, If I brake 3-layers sugar canes, BlockDropItemEvent's #getItems() should return 3 sugar canes.

Observed/Actual behavior

If I brake 3-layers sugar canes, BlockDropItemEvent's #getItems() return just 1 sugar cane.

Steps/models to reproduce

1. Listen BlockDropItemEvent and broadcast #getItems()
2. brake multi-block structures like sugarcane etc.
3. see broadcasted message - it contains only one item that player breaks.

Plugin and Datapack List

[05:23:01 INFO]: ℹ Server Plugins (6):
[05:23:01 INFO]: Paper Plugins (2):
[05:23:01 INFO]: - SkBee, SkNMS
[05:23:01 INFO]: Bukkit Plugins (4):
[05:23:01 INFO]: - PlaceholderAPI, Skript, skript-reflect, skript-yaml

[05:23:35 INFO]: There are 3 data pack(s) enabled: [vanilla (built-in)], [file/bukkit (world)], [paper (built-in)]
[05:23:35 INFO]: There are no more data packs available

Paper version

[05:23:51 INFO]: Checking version, please wait...
[05:23:51 INFO]: This server is running Paper version 1.21.11-128-ver/1.21.11@1fdbce1 (2026-04-04T20:51:11Z) (Implementing API version 1.21.11-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.11-92-e7445e1 (MC: 1.21.11)

Other

No response

Start by reproducing the issue with BlockDropItemEvent and inspect its getItems() behavior for sugarcane, bamboo, cactus, and scaffolding. Verify the event handling for multi-block structures, then confirm that breaking a three-layer structure reports all corresponding drops rather than only the broken block's item.