I managed to resolve this just now. I was having the same problem using Woocommerce Bookings on some products. I added an exclusion for all of my /product/ pages to not cache them and that worked. I’m sure you could maybe exclude the js instead of the whole page but I’m not that clever.
Go to the WP Fastest Cache settings
go to the Exclusion tab
Add New Rule (pages)
Select “Starts With”
Enter the common beginning of the URL for your products/services, in your case “https://chiangmaitour.net/tours/” and save it.
Refresh – you should be good to go, no more blocking of the calendar and the spinning wheel of death.
