Inventory scrambling and disappearance

[Castafers]

Describe the bug
When you have MythicDrops installed (free plugin on Spigot), with ECO 6.28.3, ECO starts scrambling and sometimes duplicating items in the player inventory if two or more items are moved that belong to MythicDrops. It also breaks MythicDrops RGB support, exposing RGB code from it's original lore.

I tested this with MythicDrops & ECO on their own server. Without ECO, this issue isn't present. I'm not sure if this is only with MythicDrops.

To Reproduce
Steps to reproduce the behavior:

1. Download MythicDrops (any version from what I know) https://www.spigotmc.org/resources/mythicdrops.6114/
2. Download ECO 6.28.3
3. Install them in /plugins
4. Start-up the server and join through a client
5. Give yourself a few MythicDrop items (/md give tier playername tier amount
6. Move a few of them, exit the inventory, walk around, open the inventory
7. Duplication & disappearance of the items happens randomly if you move stuff a lot

Expected behavior
Items are moved and aren't teleporting, automatically moving, disappearing, nor duping.

Screenshots
Only the exposing RGB code part
https://cdn.discordapp.com/attachments/444600506426458132/954098903433756682/unknown.png
https://cdn.discordapp.com/attachments/444600506426458132/954099026851151892/unknown.png

Server Information (please complete the following information):

Additional context
I find this seriously concerning, as there was no heads up or warnings about this. ECO version 6.29.0 fixes this problem, but nobody even knew this happened nor told anyone else. So I'm curious what other plugins ECO can be messing with or could mess with in the future and destroy a server.