User Email broken in webhook push events

Summary

After upgrading to 11.7.3 (from 11.7.0) the user_email field of a webhook push event payload is empty.

Steps to reproduce

1. Make sure to be running 11.7.3
2. Setup a webhook pointing at something that logs the json payload so you can see it
3. Wait for a push - the "user_email" field of the json payload will be empty

Important note - the email gets filled when you press the test button (for that webhook). When a push event is generated naturally, it doesn't fill the email.

Example Project

I don't have an example project for this.

What is the current bug behavior?

The "user_email" field is empty.

What is the expected correct behavior?

The "user_email" field is not empty.

Possible fixes

This bug was introduced between 11.7.0 and 11.7.3 - I have no idea which commit could be causing it. It is only broken for real push events, not generated (via the "test" button) push events. That hopefully narrows things down.