What's the most misleading sign that people want your product?

I'm building an early-stage product, and one thing I'm trying to get better at is separating genuine demand from people being encouraging.

"I'd definitely use this" A growing waitlist. Someone asking for five more features before they'll sign up. As a founder, you really want those things to mean you're onto something.

What signal made you think "this is working" but turned out to mean very little? And what do you trust instead now?

Would love specific stories, especially the ones that changed how you build or sell.