Siri calendar event default notification is 9 hours after the event. How to change?

Siri calendar events have a default alert/notification of 9 hours after the event. There isn’t anywhere to change it to default to a logical/reasonable time.

Calendar events for flights are especially concerning and annoying. If there isn’t a way to change the default time, how do you turn Siri events off?

This bug makes Siri a big problem and is a huge deterrent for using Siri. Is there a fix for this?