Summary There is a new npc system called adyeshach and it can create private npc for every player by sending packet it even support model engine and there is a bug with adyeshach and mythicmobs when you create a private npc and add model by modelengine for that npc Mythicmobs will worse
You can see some things about it in https://paste.ubuntu.com/p/85MDzNyvrv/ and adyeshach is open source https://github.com/TabooLib/Adyeshach
you also can download the jar in its action
Steps to reproduce
Create a private npc for one player select the npc and add model by modelegine
Provide a full set of steps used to reproduce the bug, including links to SEPARATE Pastebin pastes for each relevant configuration file.
Current behavior
make the add model action failed and make the mythicmobs send error message all the time
Describe what happens currently, while the bug is affecting your server.
Intended correct behavior
Disable the listner about sendPacket for Adyeshach, that plugin Describe what you think should happen instead of the bug.
Server log file
Provide a link to a Pastebin paste with a copy of your server's latest.log file from startup to "Done!" AND includes a player connecting.
Debug log snippet
https://paste.ubuntu.com/p/85MDzNyvrv/
Provide a link to a Pastebin paste with an excerpt of your latest.log file that includes debug output where you trigger the bugged behavior.
Proposed fixes
Describe what you think the issue or any potential fixes may be.