No problem 
Just to clarify, I don’t think this is really a case of the feature not working for Insert date / time - it is a different workflow.
Insert date / time is used when you have a [calendar] block in the opening post of a topic and want dated replies to appear on that particular topic’s calendar.
Create event, on the other hand, creates an actual Discourse Event ([event ...][/event]). The recurring-event end date discussed in this topic applies to that Event recurrence system.
So if your aim is to maintain a calendar local to one topic, the workflow shown in your original screenshot is the appropriate one; it just doesn’t use the same bounded-recurrence feature as Events.