When I rearranged my base several of the buildings I placed were already "ageing". When they ticked over to "Old" they were removed but not replaced.

So I've a few ideas.

Is it possible for it to place "new" buildings to replace anything that is removed but was placed as "ageing"? Not sure if that's doable or not.

Another is, is it possible to repair aging building to new buildings? I figure as they arent completely damaged they could be repaired to a new ish condition.

Which buildings are disappearing?

Whether it's been moved around shouldn't make any difference as to any bug causing it to "disappear" when aging.

I'm saying when you place an already ageing building down the bots will try to replace it with another aging building, even though you want a new one.

It should always be using a new one,although it doesn't distinguish between BRAND (never been used at all) new and used but still "new" (used but not yet turned into a version with the "aging" tag). If bots are grabbing a machine with the "aging" tag to replace with, that's a bug.

Can you give more details? Is it a machine from a mod?

nvm