[beta4] Part of calendar not selectable with slotDuration

Hi, I am encountering a problem : When I put slotDuration: '00:15:00' with selectable: true, there is a part of the calendar that we can not select anymore after 15:00.

My code:

    let calendar = new Calendar(document.getElementById('calendar'), {
            plugins: [ rrulePlugin, interactionPlugin, timeGridPlugin ],
            timeZone: 'Europe/London',
            selectable: true,
            selectConstraint: {
                startTime: '00:00',
                endTime: '24:00'
            },
            defaultView: 'timeGridWeek',
            locale: frLocale,
            columnHeaderFormat: {
                weekday: 'long',
                month: 'short',
                day: 'numeric',
                omitCommas: true
            },
            slotLabelFormat: {
                hour: 'numeric',
                minute: '2-digit'
            },
            allDaySlot: false,
            selectMirror: true,
            slotDuration: '00:15:00',
            scrollTime: '08:00:00',
            eventTextColor: '#ffffff',
        });

And When I put slotDuration: '00:20:00' with selectable: true, there is a part of the calendar that we can not select anymore after 20:00.

[arshaw]

fixed with https://github.com/fullcalendar/fullcalendar/commit/90a978e8dce5f4add8e2322652525a462febac9a. comment again when released

[cyrep]

i was having the same issue using angular 7. updating to 4.0.1 solved the issue. BUT only in development mode. once running ng build --prod, i’m having this issue once again in my production build.