[WarpGUI] Player Heads Reset to Steve Heads on Server Restart

[remiscarlet]

Describe the bug When setting a WarpGUI icon to a player head, the icon is reverted to a Steve head on server restart.

To Reproduce Steps to reproduce the behavior:

1. Start fresh server with just WarpSystem
2. /give @a player_head[profile={name:Remi_Scarlet}] to get player head
3. Set warp icon to player head held in hand.
4. Confirm player head icon is as expected.
5. Restart server.
6. Player head icon is now a Steve head

Expected behavior Player head metadata is preserved across server restarts

Screenshots Pre-Restart

Post-Restart

Additional context Memory/ActionIcons.yml doesn't seem to store any metadata regarding the player head such as UUID/SkullOwner

- item:
    Type: PLAYER_HEAD
    Amount: 1
    HideStandardLore: true
    Name: Test Warp Icon
  name: Test Warp Icon
  slot: 9
  page: TestPage
  performed: 1
  actions:
  - value:
      destination:
        id: testwarp
        type: 1

Perhaps related to https://github.com/erikzimmermann/WarpSystem-IssueTracker/issues/563

Server version: 1.21.1 (WarpSystem v5.1.14-free) Discord contact: remiscarlet

[terbin]

I have the same issue with Paper 1.21.1. WarpSystem v5.1.14 I did not have this issue with Paper 1.20.4 and WarpSystem, v5.1.1.4