autokilled after routing an ashen angel. bug?

[Endoperez]

Zeldor said:
Undead are not immune to decary, I guess it is a bug. But it does not cause any damage, it add 5 years every turn and you get a lot of afflictions. That damage type he got could be additional years.

Undead beings' maxage is huge, so they won't die from decay. I don't see why that'd be a bug. In fact, decay causing afflictions but not killing undead is pretty much what should happen when a corpse decays.

[Zeldor]

Nah, undead do not have maxage high enough. For Tartarian one battle under Decay means he really gets over his maxage and gets a lot of nasty afflictions.

And it is a bug because undead description says they are immune to all that old age stuff.