Cannot correctly resize or move multi-day events with showMultiDayTimes

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What's the current behavior?

Mutli-day events disappear when trying to resize on the week view. with showMultiDayTimes set to true. Viewable by trying to resize in the example repro: https://codesandbox.io/s/rbc-c3vbm From debugging so far it seems to be caused by invalid dates

See in the above start is invalid

Because it's calculating that diffMins = 88

But there are only 49 slots for the day, so it returns undefined, which dates.min tries to convert to a date

I need to investigate further but I'm not sure if it should be using the end of the first day rather than the last to calculate diffMins?

What's the expected behavior?

The event is resized, with only the start or end adjusted to the new time