By default, Booking.com don't display all restrictions, such as min stay, closed for arrival, max stay, min advance notice etc. This can make it challenging to see what restrictions are on your Booking.com calendar.
How to display all restrictions fields on Booking.com
Booking.com will display all (or some) restrictions on your extranet calendar if you ask them to. Message or call the Booking.com support team to "enable all extended fields in Calendar List View". Contact Booking.com - Location of Partner Only Phone number and Message methods