I’d rather not comment on details about fixes. Not that it would be anything bad or embarrassing but I feel if we start doing that, the community would expect this to happen for every issue going forward 
I am just glad they were able to find what might have been causing it.
i think you are abolutely right although i admit i feel as curious as pitmonk about this issue…
Think most of us are especially curious to know what was causing this particular bug since it’s been plaguing us for so long.
@Tascha
Hello, a thing I have noticed while farming the Black Galleon for thralls is that they stop attacking after a sandstorm has passed, you can literally kill their buddies and loot their chest and they will have no reaction unless you attack them individually. This happened while the NPCs were alive while the sandstorm passed. After killing them all and they freshly respawned they seemed to work properly again. It might be unrelated but you might wanna take a look at it.
I would assume a full wipe has occurred, seeing as 900 people were on 6 servers and probably left a lot of bodies around to feed the hyenas.
i think runing just a test-life on 1 or 2 servers will not show viable tests.
Tests should best be runned on several servers, this with low and high player-population on it to compare and see if the bug triggers.
As i have seen in these posts, mostly the bug triiggers when many people online, less on servers with low population on it.
And of course some time to figure out. Bug can not show up for a while, the come back after some playtime.
Realy hope it will be fixed, and that we’re able to figure it out through test-life in a short period.
So it seems but devs should not exclude any other possibility.
For example i had this bug happening when i was playing alone as well. It might be more related to how much stuff is going on when the aggro triggers or should trigger, but eventhen the issue seems pretty hard to identify and pretty random to me.
Here again, i can hardly reproduce this bug myself.
Of course there was different problems with the npc AI over the time, but his particular bug with no aggro at all i have never seen nor in my SP or on my server.
But again, there not many people around. SP i’m of course alone, and on my server there max 3 people online, but mostly while a test-server i’m also alone. One reason more that make me say it may be related to traffic, or like you say some activity going on. Here again, lot people is mostly also lot activity on a server.
Different kind of servers, hardware, distance, connectivity may also have a rule. Would be good to be able to track back what kind of activity, if ever, occured before the bug trigger.
Can you please confirm that this includes a fix for thralls not defending against purges? Because that’s a large problem as well.
Relax guys, in testlive, the thralls are defending again, well done devs.
I actually brought the team members, who managed to hunt the bug down and squeeze it, muffins today. They totally deserved it. I would send all you guys who helped us tackle this muffins too but I think it would be a bit over my budget. Sorry! 
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If Thrall/NPC AI is indeed fixed, I too shall engage in the imbibing of celebratory frozen dairy!
edit: Ice Cream is cancelled. The fix is no such thing, if anything thralls are dumber than before.
I wanted to chime in here and say that the thrall NPC AI doesn’t seem completely fixed.
They do actually start attacking and fight now… but only if the player gets hit while near them. If I kite an aggressive enemy over to my thralls, and dodge his attacks without attacking, my thralls just stand and stare at them. Even if one of the thralls gets hit and not me. Its only after the enemy actually hits me that they respond and start attacking.
It depends on which mob you draw in. It works fine for crocs for example. Here is what we sent after our weekend test:
Bug Report - Thrall’s Defending A Base
Testlive Server EU3
Summary: The thralls do now react to mobs but it seems that they will only attack if you are personally taking damage, so will not engage otherwise. This depends on the Mob, Crocs get attacked right away. Giants would only get attacked by thralls if we took damage first.
We lured several creatures to our archers and in all cases the thralls killed the mobs if we were present. If we left the area the thralls stopped attacking, and this is consistent with the current game mechanics - where an area will go into stasis if no players are present.
Yeah. For me it seems to be all mobs, mind where I built my base there is no crocs handy to lure over. But what you posted there seems consistent with what I found. I’ve tried snakes, scorpions, enemy thralls, and those were-hyenas from the den so far.
Most shalebacks wandering around my base near sepermeru are getting attacked by my thralls, even when my character is standing right at the top of my base (about 35 meters away from the thralls). I’m there handling my crafting stations untill i hear my thralls shouting, and then when i come back the shaleback is already dead or being killed if i was fast enough.
And some other times the same shaleback is coming about 2 or even 3 times closer than to what they are usually allowed by my thralls untill the aggro triggers. and i want to precise that the aggro in that case is ALWAYS triggered by MY THRALLS, not by me (i’m too far) and not by the shaleback which is usually simply just wandering around provoking NO ONE.
So in that case the aggro from thralls doesn’t need to get triggered by my character being hit or even any thralls of my base being hit either. As soon as my thralls feel like the shaleback has crossed the invisible line (which can vary) they will charge.
and yeah in other situatiions the figtht won’t trigger untill my character gets hit first.
I would really like it if the Thralls kept the ‘wildlife’ out of my base area without me having to get hit first. So I hope that’s what the new patch does (haven’t been able to test it yet). Looking forward to Thralls actually defending my base ‘aggressively’.
I’m not sure if that’s what it was supposed to do, but it certainly isn’t what it does in practice.
Yeah me too, unfortunately we have to keep looking without seeing it, at least for the time being.