DataComponents for BannerBlockEntity/SkullBlockEntity (BANNER_PATTERNS, PROFILE) do not sync or render for blocks placed programmatically. Paper 1.21.8-60

Expected behavior

DataComponents for BannerBlockEntity/SkullBlockEntity (BANNER_PATTERNS, PROFILE) do not sync or render for blocks placed programmatically

Minecraft version: Purpur/Paper 1.21.8

Problem:
When placing banners and player heads via plugin code, I set DataComponents directly (e.g. BANNER_PATTERNS via BannerBlockEntity.setComponents, PROFILE via SkullBlockEntity.setComponents).
After calling setComponents, setChanged, setBlockEntity, and sendBlockUpdated, the block in the world does not visually update, and I checked the banner and head data through auxiliary client mods, they are empty.

Observed/Actual behavior

Actual:
Banner/head appear blank/vanilla, components.banner_patterns/components.profile missing, no visual changes.

Is this a known DataComponents sync/render bug with Paper/Purpur 1.21.8? Is there a workaround to force block update with DataComponents for banners and heads?

Steps/models to reproduce

Tested:

• Verified banner components after placement: banner.components() contains the correct BannerPatternLayers, but not visible in world nor /data get block

Expected:
Block visual state should reflect the DataComponent (patterns/skin), and /data get block (or equivalent) exposes the DataComponent for tile entities after placement, especially after updatePacket/broadcast.

Code sample:

blockEntity.setComponents(newComponents)
blockEntity.setChanged()
world.setBlockEntity(blockEntity)
world.sendBlockUpdated(pos, state, state, 3)

Plugin and Datapack List

ℹ Server Plugins (13):
Bukkit Plugins:

• HeadDatabase, LuckPerms, MYTHSetup, PlaceholderAPI, ProtocolLib, Vault, ViaBackwards, ViaVersion, zChat, zEssentials
  ZETRIUM, zLibs, zWorldEdit

Non-homemade plugins: HeadDatabase, LuckPerms, PlaceholderAPI, ProtocolLib, Vault, ViaBackwards, ViaVersion

Paper version

This server is running Paper version 1.21.8-60-main@29c8822 (2025-09-06T21:49:13Z) (Implementing API version 1.21.8-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.8-2487-3850f35 (MC: 1.21.8)

Other

No response

Reproduce the issue with BannerBlockEntity.setComponents or SkullBlockEntity.setComponents, followed by setChanged, setBlockEntity, and sendBlockUpdated, and inspect the result in the world and with /data get block. Trace how BANNER_PATTERNS and PROFILE are serialized, synchronized, and rendered; done means programmatically placed banners and heads visibly update and expose their components after placement.