Custom item use cooldowns don't work

[VidTu]

'/viaversion dump' Output

https://dump.viaversion.com/9f2c409337701d2716a574369ed0b64e585cbffe113b28d5e1d75305c73fbeb3

Console Error

No response

Bug Description

Custom (org.bukkit.Player.setCooldown(Material, int)) item use cooldowns don't work for 1.12.2 players on the 1.18.2 server

Steps to Reproduce

1. Setup a 1.18.2 (paper) server.
2. Join with the vanilla (1.12.2) client.
3. Use the org.bukkit.Player.setCooldown(Material, int) method via some plugin.
4. Notice the cooldown not displaying.

Expected Behavior

The cooldown should display, because its packet exists in 1.12.2

Additional Server Info

Test plugin code, compiled using latest (1.18.2-R0.1-SNAPSHOT) paper-api:

package test;

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.jetbrains.annotations.NotNull;

public class TestPlugin extends JavaPlugin {
    @Override
    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
        if (!(sender instanceof Player p)) return false;
        p.setCooldown(p.getInventory().getItemInMainHand().getType(), 200);
        return true;
    }
}

Checklist

• Via plugins are only running on EITHER the backend servers (e.g. Paper) OR the proxy (e.g. BungeeCord), not on both.
• I have included a ViaVersion dump.
• If applicable, I have included a paste (not a screenshot) of the error.
• I have tried a build from https://ci.viaversion.com/ and the issue still persists.

[Barvalg]