Since entering the summer release program I have been having a couple issues with Calendar sync and the 2 nights between bookings setting not being honored. Airbnb chat support is useless in getting these software bugs reported to the correct people. I can't be the only one having this issue.
If someone is booked from the 15th to the 17th for example, on Google calendar it will show them checking out on the 16th. And the entry is not editable in Google calendar as it is a locked file coming from Airbnb.
I also have the "block the night before and after a booking" setting enabled since Covid. Now, even though that is set, Airbnb is allowing next day bookings. I think these two bugs may be related.