Here is Airbnb Long Term Rental cancellation policy regarding in-progress long term rentals:
If the guest cancels the reservation during their stay, the guest must use the online alteration tool in order to agree to a new checkout date. Regardless of the checkout date chosen, the guest is required to pay the host for the 30 days following the cancellation date, or up to the end date of the guest’s original reservation if the remaining portion is less than 30 days.
My guest was well aware of this and changed/cancelled their checkout date, reducing it by 30 days. Airbnb allowed this alteration automatically (per policy), but did not charge for the 30 days non-fundable per the policy. This is a glitch in their system (or so I believe) and I am currently in contact with support. Anyone else have this happen and how was it resolved?