See http://www.punchwood.com/index.php?/topic/21789-iron-golem-despawn-zombie-siege/
Brief: I have a village that started with about 10 villagers. Two iron golems spawned for them (many buildings/doors). I killed a couple villagers (passively, no aggro) to get new ones to spawn for better trades. So that left around 8. I left town for a while and came back and one of the golems was gone. The town is completely surrounded by two fences with no way to jump over, and it's lit up like a Christmas tree.
With no way in or out and no damage from a creeper evident, the golem is just gone. Despawned? Don't think so.
Is there any way to find out what happened to it? I don't know if it somehow disappeared "naturally", was killed, or if there's a glitch somewhere. I have a snapshot of the world from a couple days ago. I could replay but certainly can't reproduce everything exactly. Happy to help with diagnostics.
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kumasasa
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There's no ocean exposure and in this naturally occurring village the only water is in a few gardening beds that have 1-deep water. The golems don't wander from the town center - as discussed in other tickets here, they're following the same logic that keeps villagers focused in one area of town.
I think iron golems have 100 hits. It would take a hoard of zombies to inflict that much damage - and there's another golem here to help. The attack would have had to happen all at once. (Do golems heal over time or are they like armor that just wears down?) Since we don't have sieges in 1.6.4 and there's no access to the town, it's unlikely this is what happened. Also it's unlikely that all the mobs killed a single golem and left the villagers unharmed.
All I can think of is that a spider (or spider jockey) hopped the fence and got stuck attacking a golem who also got stuck just taking the punishment. Afterward the attacker moved to a different target and was then killed by the second golem.
All of these scenarios are extremely unlikely, leading me to believe something has gone wrong.
Is there any code that would cause an iron golem to despawn if it gets stuck in an infinite loop in routing or fighting?
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At this point I would be comfortable if this got flagged as a dupe/effect of MC-2025. The most plausible explanation is that the golem glitched out and suffocated.
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Trying out Minecraft 10, and every time I build a golem and leave the area, it has vanished. I have a well lit walled town, as well as a large well lit underground area with doors and walls to keep it in a central area, and they keep vanishing.
Even Iron Golems take damage when fighting with other mobs and will be finally destroyed.
Also look in the ocean or >2 block deep ponds if the Iron Golem is walking on the ground.