Availability from gCal not working ok with daily duration - ALLOWS OVERBOOKING

To reproduce:

A product has duration 1 day. There is only 1 global rule for being available from Monday to Saturday.

And these are the gCal rules:

So, 02.06.2020 should not be available. But it is.

Then I tried to see if it might work by using 24 hours duration and interval. And it works as there are no slots available, but the day still shows up like this:

Reported here.

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