'Error: Invalid cache fill interval' when a child event starts before parent

[isglass]

https://forum.bryntum.com/viewtopic.php?f=51&t=28775&p=144783#p144783

Nested event scheduled earlier than its parent causes calendar exception.

Reproduction:

import '../../lib/SchedulerPro/feature/NestedEvents.js';
import SchedulerPro from '../../lib/SchedulerPro/view/SchedulerPro.js';

const scheduler = new SchedulerPro({
    appendTo  : 'container',
    startDate : new Date(2022, 2, 29, 7),
    endDate   : new Date(2022, 2, 29, 21),
    features  : {
        nestedEvents : true
    },
    project : {
        resourcesData : [{ id : 1 }],
        eventsData    : [
            {
                id        : 1,
                startDate : '2022-03-29T10:00:00',
                endDate   : '2022-03-29T17:00:00',
                name      : 'Parent',
                children  : [
                    {
                        id        : 11,
                        name      : 'Before',
                        startDate : '2022-03-29T07:40:00',
                        endDate   : '2022-03-29T08:00:00'
                    }
                ]
            }
        ],
        assignmentsData : [
            { id : 1, event : 1, resource : 1 },
            { id : 11, event : 11, resource : 1 }
        ]
    }
});

Throws: