RFI says one thing, Architect's email says another. Who usually eats the cost for the rework?

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Quick sanity check for the Supers and PMs in here. I'm trying to figure out how common this specific nightmare actually is. Here's the scenario: The official RFI in Procore (or whatever system you use) gets approved for Spec A. A few days later, the architect or client sends an email to the PM changing it to Spec B. The PM misses the email, or forgets to officially update the drawings/field team. The field guys do their job and build Spec A. Now the wall is up, the concrete is poured, and som...