@Thomas2281. Yes happened to me only 9 days ago and thought I had somehow made an error in season criteria!. Booking exit date (so not even staying that night) was also beginning of 3 night min so maybe @Mike-And-Jane0 is correct its an old bug still not fixed.
No hack, I just went in and manually changed it all back to 4 (so who made it 3??)- and not for the first time. I have only just opened up calendar to include the next holiday period and will check it all the time. Will also utilise other platforms as required.
Yes, where is this rule change notification? I expect its another bug. Maybe I will raise it too, especially as my acceptance rate on a new listing now looks s*h#t. 😉