Apple Holidays Calendar shows holidays as 'all week' and not as 'all day' in month visualization.

The (Brazilian) Holiday Calendar is showing some (not all) of the holidays as 'all week' in the month visualization.

When seen on 'week' or 'day' the appearance is normal as should be (all day only).

The curious fact: this bug only occurs when the week start on sundays (what i want), when starts on monday the 'month visualization' is correct.

Very annoying

No idea how correct this.

Calendar: https://calendars.icloud.com/holidays/br_pt.ics