Process Calendar 24h 7 days

I'm trying to define a 24h / 7 days process calendar.

1) Selecting columns:

If I select Monday's column (for example) and:

* start time: 0:02

* end time: 23:59

it works.

But when I modify start time to 0:00 or 0:01 the hole column days is setted as holidays.

2) Selecting a unique day or a group of days:

If I try to define 'start time':00:00 and 'end time':23:59 it works

Any ideas about the reason and how to fix it?

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