The first avalable time slot is not at the begining of the shift

Hello again,
The problem is that the first avalable time in a fully available day is not at the begining of the shift working time. So, in my case, the first available time slot should be at 8:30, but only at 9:00 appears. See it on https://dev.nvstudio.ee/

My settings are the following:
“hours_before_from”: “+1 hour”,
“interval”: “90”,
“availability_mode”: “advanced”,
“from”: [“8:30″,”8:30”],
“to”: [“20:00″,”20:00”], “always”: true,

Probably, it caused by the SLN_func->getMinutesIntervals method, which splits 24 hours for the equal time slots starting from 0:00. However, in this case, since a shift working time is set, it should split the total working time of the current shift(from 8:30 – to 20:00).