Apple Watch Calendar Reminders Don't Mirror iPhone for Some Events

I have calendar notifications in my watch set to mirror my iPhone. However, calendar appointments in my iPhone/Exchange calendar that do not have a reminder still throw a reminder notification on my watch 15 minutes before the event.

I have deleted the event and re-added it and that does not help.

I have unpaired and repaired my watch and that does not help.

Please let me know how I can stop receiving notifications on my watch for events that do not include a reminder on my calendar.