Appointments created remotely by CalDAV do not have the default reminder time applied despite having Enable reminders for new Events being checked. Specifically, if I create a new appointment (or someone creates one for me), the appointment is correctly synced, but the reminder is not applied. Marking this "major" severity because it results in missed meetings and defeats the purpose of having default reminders.
I can't reproduce this with KOrganizer 5.18.0 and a recent version of Nextcloud. Note that the Folder Properties dialogs of the calendar and of its folders has a "Block reminders locally" checkbox that would keep you from seeing the reminder. Could you try this again and see whether the problem went away?
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I'm no longer in a good position to restest this, as my environment has changed. So feel free to close it, and if it pops up it can be reopened.