Recurring events only show first index

Problem/Motivation

I think this is a follow-up for #2820803: Support Recurring Dates Field in Calendar 8.x-1.x

In a calendar view with date_recur field occurrences, each calendar event only shows the first 'index' of the field.
If for instan

Steps to reproduce

- create a node type with date_recur field
- create a node with the following time slots:
-- each Monday from 1300-1700
-- each Tuesday from 0900-1200
-- each Tuesday from 1300-2100
- create a Calendar view with Calendar entities, using 'Add view from Template', select 'Content Field DateRecur on Calendar'
-- the view already has a contextual filter
-- add a relationship for 'Occurrences of DateRecur'
-- add Fields: Occurrences for Content DateRecur field: (field_daterecur), for both value and end_value
-- Note: The setting Multiple field settings / Display all values in the same row is not available here - that is OK.
-- check the view. Each day contains the correct amount of time slots, but displays identical data from the first occurrence.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes