Human pets cause all clients that can render them to disconnect with "Internal Error"

echopet 371
spigot 1368

@1Rogue It's both server-side and client-side due to the nature of the human pet packets being sent.

I just need to review the values being sent in the packets (so that it doesn't cause client problems) when I get the time.

Error is server-sided, not related to clients. Full output observation on an mc instance when entering server:

[01:06:12] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:music.game.creative
[01:06:12] [Client thread/INFO]: [CHAT] [EchoPet]  Your Saved Pet (Human Pet) now follows close behind you.
[01:06:14] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:gui.button.press

(Sound warnings were my own thing from running through an IDE, but there is no visible error).

Most likely need some more debugging on the server end, but is reproducible.