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I remember running into this at a past employer where TLS certs were core to the business. It happened on a New Year’s Day, and I spent a lot of that holiday trying to fix it.

hacks.mozilla.org/2019/05/tech

The core problem is people mostly only think about roots and leaves; it’s not until you get bit by this that it starts to become institutional memory.

The problem is intermediates are often signed for ~3 years - just long enough for a lot of the engineers who set them up to have left or to be mostly forgotten because they just work. Three years comes faster than you think...

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