If I run a place where shifts go usually over night and therefore I set default shift start and end times. For example, start 17:00 and end 01:00.

Currently happens that when employee submits his (un)availabilities, by default these are also displayed over night in the schedule, as seen on the screenshot below.

Vote, if you need that shift default start/end time should not apply to (un)availabilities. If you need that (un)availabilities are displayed on a single day.