[Cata] SMSG_UPDATE_OBJECT fails and disconnects client

[Appled]

Description:
Your client gets randomly disconnected while moving around. This can also happen on login. For example I was logging in and in the end of loading screen, the loading screen like repopped and started over. After that I got sent back to realmlist. Worldserver says this: https://image.ibb.co/cAz8Xz/worldserver.jpg
Another picture (this happened while I was moving around): https://image.ibb.co/fRCvCz/disconnects.jpg

Also sometimes it doesn't disconnect, it puts your character into weird state where you are not in game according to worldserver and you cannot see any textures.

Steps to reproduce the problem:
I got it reproduced everytime with these steps:

1. Logon any character
2. .recall port stormwindharbor
3. Move the stairs up behind / in front of you

Version: WotLK / Cata (Specify Version)
Cata only
AscEmu hash/commit:
4dabcc1
Operating system:
Win 10 Pro

Additional notes: I have vmaps and maps built

[aaron02]

maybe this means something to the zones they added crossrealm support so opcode needs to be handled in someway but its just a guessing

[Appled]

@aaron02 weren't crossrealm zones added later in MoP? I can be mistaken though

[aaron02]

i played evry expansion correct me if i am wrong but first cross realm zone was westfall / bridge to wald of elwin added in cata

[Razfury]

Crossrealm was added in mop 5.0.4
https://www.pcgamesn.com/wow/world-warcraft-will-let-players-cross-realms-play-together

[Meltie2013]

First parts of Cross Realm Zones where implemented in 4.3.4a, near the end of the Cataclysm Expansion. The full CRZ was done in MoP.

[Appled]

So far we know that this is caused by SMSG_UPDATE_OBJECT opcode but this opcode is sent from so many different places so it will take time to find the faulty packet.

[Zyres]

While trying to reproduce this issue...

I got teleported to the area, not really sure if it is related to this issue.

[Appled]

Yeah, that also happened to me several times

[Zyres]

Not reproduceable with 7df0940

[Appled]

Happens again with 4dabcc1
I've updated the issue with new steps to reproduce the issue.
Worldserver spams "Object update failed for playerguid".

[Appled]

Actually it was a mistake in my PR XD