Hi everyone, this was driving me crazy. But I think I figured it out.
the problem:
When setting 1 day prep time in the settings, airbnb will block 1 day before check-in date of booked guests, meaning other guests cannot book nor check-out on this date. Which is a bummer, cause you do have time to clean after a check-out to check a new guest in the next day.
They also block the check-out date of a booked guest, which is fine, nothing to change here. (You need it blocked to clean)
solution for now:
I realized direct after a booking you can go to the calendar and click on the date before check-in, you will see it is blocked because of prep time.
next, make it available and save.
then once again click on this date and block it manually. You can also add a note: check-out only. It works! Now this date is available for guests to choose as check-out date only.
I played with these settings, went as traveler mode to see how they appear and it works!