Anyone who has worked at a B2B startup with a rouge sales team won't be surprised at all by quickly pivoting the backlog in response to a hallucinated missing feature.
Rogue? In the B2B space it is standard practice to sell from powerpoints, then quickly develop not just features but whole products if some slideshow got enough traction to elicit a quote. And it's not just startups. Some very big players in this space do this routinely.