[2020] Zombies are clearly dumber in A19

Hmm. Nope. I remember looting that building, and the lead zombie would always break through the false wall and fall out, allowing the others to step off. They were made more random to seem less single minded and more chaotically 'zombie-like', though.

Originally posted by ViperV: always happens in the rooftop of those new bookstores. they fail to attack the fake wall and get stuck there.

Specific instances of sleepers not exiting their hiding spots can be addressed on the world builder side, so I encourage you to file a bug report on the official forum.

Originally posted by I can't spell: My concern is that it seems like they completely re-write the AI from scratch with each Alpha instead of incrementally improving it through small tweaks over time and rigorous situational testing. That code is probably the most important code within the entire game IMO.

There was a big change in A17 to A* pathfinding, after they hired a dedicated AI programmer. That was necessary to make it possible for zombies to reach you no matter where you are. That’s not going to be rewritten now. AI changes after that are basically layering niceties and special cases on top of that foundation, such as zombies occasionally doing something more random so they don’t all file in the same way like robots, and accommodating more stumbling/falling over animations.