Would like to point out 2 issues here:
how does the app refresh its timeline? There is no refresh feature, nor sync preference, so the calendar/reminder sync appears to be random. Sometimes it happens instantly, sometimes not even after minutes.
For example: created a reminder in ios reminders, it shows in iOS Agenda, but not in Mac Agenda.
(in other cases it shows instantly, ex. for other reminder items or from calendar, so it seems to be random)
When adding a reminder from ios reminders app, with a date, but without a specific hour (like an all day reminder), it appears in the Agenda timeline always in the day before. So for example: reminders app item is on 7th July 2019, Agenda shows it on 6th (all day). Why it does not show on 7th (all day)?.
Obs: if created from Agenda, the reminder shows correctly.