PC On a Blood moon, Do Z's ignore you when you are at a particular location?

[Maikeru]

I assume they first did dig downwards otherwise they would have been stuck at middle of the ladder height. So they principally are able to dig down but some bug must have stopped them. If you know of a way to replicate it with high probability, write it down and make a bug report.

We'll see.  But I think it is more of an AI behavior than a bug though.  But will see.

 

[PBRstreetgang]

My guess is the Zs analyze the next block they would need to break to get to you. So the 250(?)hp earth/stone block or the 500(?)hp+ iron bar. That's why they choose a door over 2 concrete blocks or a cobble block over a concrete block. The Zs in this game are quite the engineers! I think your iron door idea might work. I suggest using an iron or vault hatch instead so you can fight them while they beat on it.

*PS- I've also had Zombies dig/jump/climb/run around an electric fence to avoid it.