Secondary Metric Exposure (and most likely Win Probability) doesn’t seem to work

[jurajmajerik]

Bug Description

Bug description

I’m guessing this is once again due to an assumption about how exposure is determined (most likely using the $feature_flag_called event rather than the first event in the funnel. However these secondary metric win probaibliyt calculations don’t seem very trustworthy when the exposure says 1.

How to reproduce

Additional context

Debug info

- [ ] PostHog Cloud, Debug information: [please copy/paste from https://us.posthog.com/settings/project-details#variables]
- [ ] PostHog Hobby self-hosted with `docker compose`, version/commit: [please provide]
- [ ] PostHog self-hosted with Kubernetes (deprecated, see [`Sunsetting Kubernetes support`](https://posthog.com/blog/sunsetting-helm-support-posthog)), version/commit: [please provide]