It has come to my attention today. That the Woo Bookings Dropdown plugin I created, not only only works with Availability blocks being set at the product level (Product Data > Availabilty (tab)) but it only works with the date range option in the Availability Type field.
I am not sure when this became the case, or if it is the case with older versions of WooCommerce Bookings. I will be spending some time in the coming days/weeks to investigate this and to add support for other Availability Types.
As always if this issue is affecting your site directly and you are interested in funding this work, then that will always speed up the fix, as I must put paid work before my open-source work. Also it will mean that your Availability Type(s) specifically are handled first.
Other than that thank you for your patience, and to all the site owners running my plugin thank you for your continued support.
Like the code you see here? You can hire me at Codeable.io - a WordPress specialist outsourcing site that vets developers to make sure they are of the highest standard. See all developers you can hire through Codeable here.