Custom Schematics on Servers Are Not Being Sent to Clients

Prerequisites

• I am running the latest alpha version of MineColonies and Structurize for my Minecraft version.
• I checked the MineColonies/Structurize wiki and made sure my issue is not covered there.
• I made sure that this issue is not a duplicate of any existing issue.

Context

• Minecraft Version: 1.18.1
• MineColonies Version: minecolonies-1.18.1-1.0.328-ALPHA
• Structurize Version: structurize-1.18.1-1.0.319-BETA
• Related Mods and their Versions:

Expected behavior

I would see my custom blueprint as a preview on the client.

Actual behavior

The default schematic is shown as a preview on the client. However, when actually built, it uses the custom schematic.

Steps to reproduce the issue

1. Extract a schematic for a building from the jar file.
2. Place the schematic in a creative single player world using the "Keeping Placeholder Blocks" option.
3. Modify something visible, scan, and save the new custom schematic (using the original name of the building).
4. Verify the schematic was changed properly by building it in a new location. The new schematic will be in the "My Schematics" section in the UI.
5. Copy the custom schematic from the "new" folder to the server into the correct folder using ftp or similar.
6. Connect to the server in-game.
7. Use the build tool to preview the building you modified. It should now be in the standard location in the UI.

Optional: Instantly build the building using creative mode to see what version gets built. It will build your custom building correctly. It's just the preview that is wrong.

Logs

N/A

Notes

The client's structurize/ServerUUID/schematics/ folders have no blueprint files in it. So I am guessing that are just not being sent to the clients.

Viewers

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Start with the reproduction steps and trace how custom schematics are synchronized from the server to the client for build previews. Compare the schematic data used by the preview with the data used when the building is constructed. Done means a client receives the server's custom schematic and the preview matches the structure that is built.