[Bug] NPC (Citizens) Models unload after restart server

[drAkeSteinn]

✔️ Pre-check

• [ ✔️] Tested with the latest snapshot of BetterModel from Modrinth
• [✔️ ] Confirmed the issue occurs without other optional/experimental plugins or clients (see Disclaimer below)

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🐞 Problem Description

When a model is assigned to a Citizens2 NPC, it is assigned correctly; the problem arises when the server is restarted or started up again—the NPCs appear without the model.

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🖼️ Screenshot / Video

Video
https://drive.google.com/file/d/1txyX_HULPmMItm0UEjdJl_nMwQ4XBgo9/view?usp=sharing

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🌍 Environment

• OS: Windows
• Server software & version: Paper-1.21.11-132

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Disclaimer

The following environments are not supported, and issues occurring under these conditions will not be handled:

- Informal / modified launchers (e.g., Feather client)
- Closed-source mods/plugins (Optifine, ItemsAdder, Nexo, etc.)
- Hybrid server platforms (e.g., Arclight)

[toxicity188]

if you're using Nexo, follow #324